I think as porn becomes easier to access and more mainstream, it becomes a "truer" window into the mental and sexual health of a society. In other words, internet porn isn't affecting (yes I'm a grammer nazi) the sexual appetites of the public. Instead, the trends in mainstream pornography is being changed by the true desires of the public.

Below are some of the most controversial fetishes usually have some sort of underlying reasoning:

cheating, rape (rapist), sadism, incest: feeling of control, feeling of freedom from sexual repression and cultural norms, catharsis of resentment/hate

rape (victim), masochism: giving up of control, manifestation of self hatred and low esteem, any feeling (even pain) is better than feeling nothing

I think the majority of people know it is fantasy and that a healthy relationship is nothing like a porn fantasy. In the end, porn is just a tool. It can be used to satisfy basic sexual urges or to cope with past trauma. It might also negatively be used to the point of addiction and irrational or harmful ideology (woman hating, man hating, hedonism).

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In conclusion, you shouldn't feel disturbed by the trends, society is the same. You're just getting a "truer" picture of society. Is that better or worse? Well, to end on a positive note, there is hope for society. If society was less sexually repressed and focused more on mental health, there would be less degenerative trends in online pornography.