I've heard some Christian preachers say it's all caused by demonic possession, and to be honest I think there is some value in using that allusion. Not that I think mental health conditions are caused by literal demons, but they definitely seem to get exasperated by certain stimuli and relationships, it's of little wonder to me that people would see that and assume one was possessed. Religious ways of thinking also tend to condition the mind to outright reject certain things as well so could be seen as a means of protection.

The internet itself is quite dangerous to give kids unfettered access to. I think all of this essentially boils down to various kinds of porn addiction.