Okay, so you're one of those obnoxious militant asexuals who makes all other asexuals look bad by association. That or a troll. Fine, you're awful, whatever. If nothing else, you're a useful target to argue against for opening up a discussion to justify the existence of adult content to whatever buffoons are actually responsible for this idiotic decision.
Let's look at the causality of adult games and other forms of pornography, specifically pornography with fetishes that would be really bad in real life since that seems to be what you're focusing on (with the blatantly incorrect assumption that all of it is rape or similarly bad stuff; it's not).
Possibility #1: Consumption/production of porn with dangerous fetish increases likehood of people to do that fetish in real life, as you say
Possibility #2: Consumption/production of porn with dangerous fetish helps people get pre-existing desires out of their system, decreasing likelihood of people to do that fetish in real life
Possibility #3: No correlation between consumption/production of porn and likelihood of people to do that fetish in real life; they have a complete disconnect between their thoughts on the actual act and fictional depictions of it
I would guess that all of these occur to some degree, varying from person to person, with #3 being the most common, and #2 being common enough to cancel out #1. I don't actually know, there'd have to be some huge international statistical survey to even begin to figure this out, and if it's happened I don't know it. But until it's certain, the possibility of #2 seems important enough to not just throw it all away out of fear of #1.
There's also a variant of #2, where people try to use porn to get whatever messed up desires out of their system, but fail and end up doing it anyway. This is the most common cause of "There have been many incidents when people playing these games actually did the stuff shown in the game". They would have done the bad thing regardless, the porn was simply an indication of their interest; correlation does not imply causation. Also, though I admit that I don't know the statistics, this also seems like another explanation for "Also many people suffer from psychological problems from playing these games."; maybe it's just that people with psychological problems were more likely to play them.
Regardless, even in the absolute worst case, if you are completely correct that porn only increases the likelihood of rape and other similar sorts of bad stuff and psychological problems... they still wouldn't be "ruining the world" as you've said. They'd be causing a few serious problems, which would get thrown into an ocean of other even worse problems. You know what is ruining the world? Evil and incompetent governments and corporations trying to control everything and everyone and horde all the world's wealth. One of the many methods by which they do this is... censorship! Controlling what we can say, what information and ideas we are allowed to access. They regularly go after adult content because it is such an easy target (because of beliefs like yours), and once they have some laws in place to control it... hey look it turns out that those laws contained a bunch of loopholes that make it apply to stuff other than porn, and sets some precedents that make it easy to expand further with even more laws, now everything is censored, now we are no longer able to even talk about it or know about it let alone resist it whenever some government or corporation destroys the environment or uses slave labor to make their product or commits genocide.
That seems a lot more "evil" to me than drawing or writing about people having sex.