How many 20-year-old boys do you know, otto?
As I've explained before, for decades it was a rite of passage for young men in the Southwest U.S. to drive to Tijuana, Mexico, to see women copulate with donkeys. I don't know why that was a turn-on (maybe because I'm not heterosexual), but it certainly didn't mean that all those young men actually intended to have sex with animals themselves or even to make a habit out of watching others do it.
The "kick" came largely because it was forbidden, I believe.
Personally, I've never looked at bestiality photos, but I admit that when the internet first became available, I looked up the autopsy photos of Nicole Brown Simpson. I haven't looked at anything that graphic since, but I was curious.
In RS case, do we even know what he was looking at? As for his "having to be monitored," that was an administrative decision; without more info, we can't judge for ourselves whether it was necessary.
Bottom line: RS was never accused of actually molesting an animal. Boys look at all sorts of things during adolescence. RS and his computer photos wouldn't even be an issue if the prosecutor weren't trying to make a case for "sex games gone wrong."