"Typically, a certain amount of responsibility is put on individuals to behave in a manner that is reasonable to them, instead of looking for a scapegoat whenever someone behaves in a manner which could be argued to be negative. This isn't to discount external factors (i.e. socioeconomic ones) entirely but there isn't always something sensible which can be done. People live their own lives."

The wording might be a bit rough but I think it gets the point across. I might remove "a certain amount".

"to them" is there mainly because I don't want someone to come up with a ridiculous standard, then to argue that it is "reasonable".

It is honestly strange to see someone make arguments like guns don't kill people, people kill them, then to rush to absolve someone of any responsibility and to use porn as a scapegoat for their actions. Where did the personal responsibility go?

What about alcohol? Someone is expected to handle that responsibly, and they're held to account for their anti-social conduct when they do not.

Pornography is neither a weapon or an intoxicant. It is a bunch of pixels on a screen which people find entertaining and pleasurable.