Rather than belabor the point, I think that most folks would agree that what we take in (be it food, drink, or mental images), tends to influence us. There is clearly a correlation between violent games, video images, and the upsurge in violence by some (not all, but some) individuals who partake of such things. Banning is not going to be practical, but assuring that such things are not quite so easy to acquire is a step in the right direction. We would not want alcohol to be available in soft drink machines, neither would we want porn to be distributed in 'Highlights' magazines for children.
We are what we choose to fill our minds with. It may well be that some people are able to drink without any problems, some people become nearly instant alcoholics. Some may be able to handle pornographic images, but many (as in the case of Ted Bundy) were not, and it was such imaging that began them down a very dark path which ended in nothing but human tragedy.
The facts speak for themselves.
I agree. Pornography should be difficult to obtain, not difficult to avoid.