Oh come on he knew damn well that when he started to mess with his head, he was gonna hurt him. It's not like you decide to ruin someone's privacy like that and then go "whoops, had no idea I was doing anything wrong, sorry bro."
I'm sure he didn't mean to push him to his death but still, it's such a nasty thing to do. I don't know about the sentence, 10 years sounds like a lot of time but if he got 1 or 2, would that really change people's mentality towards this issue? Honestly, I'm not sure.
Living with that kid's death will be a massive burden anyway, regardless of jail time.