I'd say he was more horny than depressed, since he stalked girls for a while. In my humble opinion the current generation of college kids is scared to engage in sexual relations because of aids and stuff, so I'm not surprised.
Yeah... College students afraid to have sex? That's...
I don't think so. And even suggesting that almost implies that the girl Cho was stalking (or any girl fro that matter) would be doing something wrong or unintelligent by chosing not to have sex. That's a frankly dangerous mentality to even consider. Seriously, though, why should college students be having sex? Unless their married and living together on campus, that's not what college is for. Being horny is no excuse to stalk a girl anyway, and from everything else I've heard, Cho wasn't a pleasant guy to begin with.
I don't mean to harp on this, but you seem to be implying that the tragedy could have been avoided if he'd just been able to find someone to sleep with...
Maybe that's not what you meant to imply, but that's how it came across.