Why is taoism or the yin yang symbol portrayed negatively in anime?

I noticed in many Aime the yin yang symbol is displayed on the antagonists. Is this because of the cultural history, anger between Chinese and Japanese that exists amongst some today?
BTW - :O) I am familiar with Taoist philosophy, as I've worn a yin yang around my neck since 1994. I am no sage, yet not an amateur either. I've just noticed in many of the Aime I've watched the yin yang symbol is displayed on the antagonist clothing, skin, some way or another. Likewise, many times the antagonist is referred to by the heroin in such manner, "Taoist sorcery". It's not necessarily stated with negative connotation, but still this association is common enough to be noticeable.
As suggested, perhaps it's just me, as I personally felt there may be some negative aura connected between the symbol and the "bad guys", because Taoist teachings are very personal to me.

Also, as mentioned, perhaps it is just a symbol that is attractive in some manner for visual association, similar to a crucifix in many vampire movies.

Likewise, how the pentagram or pentacle is usually associated with "evil" characters in movies.

you mean reflections of the author based on the stories they write? your putting in too much thought into it so i say i don't think so mostly i think its just cool to have a tiger and a dragon fight don't you?

no, I am Chinese and I LOVE mange and Aime. Yin Yang symbol is so old school. It is not portrayed in positive or negative way. It is like people use the cross symbol in those vampire movies and TV shows.

Yin and Yang symbolizes good and bad, and if you're seeing it associated with antagonists, it is probably to imply something about the duality of human nature. How people can do evil things, because its for a greater good, or that although their actions may appear evil, in their own minds they feel that the end justifies the means. There cant be good with out evil, you wouldn't appreciate sunshine without rain, that's what Yin and Yang is about.

Yin Yang has two parts, white and black and in these two colors contain two spots of opposite colors. It means there is no totally good and completely bad in the world. There is also bad thing in the good as well as good thing in the bad. Therefore, as overall, it mean there is no "perfect".

Excellent perceptive skills you have. I am not very familiar with Aime so I do not know if this is true, but if I take your word on this than I do have somewhat of an answer for you.

There are several different "Asian" philosophies that all rose up during the Waring States Period from 403-221 BCE. during the development of the Silk Road, which include Legalism, Daoism, (erroneously called "Taoism" in western culture), Confucianism, and Buddhism. Too make a long story short many wars were fought and many empires came and went but all rulers had their individual philosophy that they either directly implemented against the will of the people which led to rebellions, or were embraced by people which led to support for new empires/ dynasties to take over. At this point there were no "counties" per SE, but only geographic regional terms used to identify lands. I could be here forever but the empires involved were Yan, Zhao, Wei, Qi, Han, Chu, Qin, and in later years the Tang and Sui. The boundaries of these empires were not defined by country, but by territory. Around these times there were indigenous peoples living in Japan that sometimes wound up under some Chinese Empire rule or influence. There's a lot of details but all in all philosophies were the basis for how emperors ruled their empire. There were many opposing views that are still evident today just like Christianity vs. other religions in western culture.

The more oppressive philosophies were Legalism and Confucianism were more commonly enforced especially by the Qin, even though many common people embraced Daoism, (it was consistently repressed). Some of the core beliefs of Daoism include a belief in a cosmic consciousness, all are one coming from the same source, that people naturally are supposed to be happy, the best way to be happy is to live in harmony with nature and everything has reason, mysticism and beauty. The yin and yang symbol represents balance of masculine and feminine energy, as well as general balance of the universe, (Yang=light, masculine, the sun), (Yin=dark, feminine, moon).

Personally I definitely see some truth to the Daoist philosophy and can understand why a government might want to repress it. The idea of any type of control or government directly contradicts this philosophy, and with the perpetuation of the challenging of Daoism by the state will limit descent against the empires. If such is portrayed negatively in films, one can only assume this is implementation of subconscious imprinting designed for culture creation, much like that in the united states with pop culture and the mainstream media influencing or views and creating a type of "group-think" that limits independent thought and encourages conformity. In other words, propaganda.

As for the pentagram and pentacle, it is not evil, but it was portrayed as such by the Christian Church in an attempt to demonize Pagan and Wiccan beliefs and spread their own. The five points represent the five elements and extremities of the human body and it is used to channel certain types of energies when used in spell craft. If you want to get technical the degree of the angles represents something else, the list goes on. Anyways there is an objective truth about our reality that is called esoteric knowledge. This knowledge is hoarded by the elitist/ royal bloodlines, whom implemented repressive religions and false gods to hinder our spiritual nature. The esoteric knowledge is represented by the "Eye of Providence" as shown on the back of the one dollar bill, while the underlying bricks represent the ignorant misguided blind sheeple that is the common people. Such images date back 17,000 years predating the first civilization of Summer (4000 BCE). Coincidentally Summer is the origin of many royal bloodlines as far as modern recorded history goes.
There is reason our governing bodies want to keep the truth hidden. Daoism was just a little too close to the truth. I'll leave it at that.

This only lightly scratching the surface of all there really is to know about all this, but hopefully this sparked a train of thought or interest within you to seek out truth for yourself even in areas where it is discouraged. There is more to everything in this world than meets the eye. Question everything. Only those with the right perceptive skills can evolve.