My initial take: may as well. Everybody is already shocked, grieving, and angry. The criminally impressionable types are probably already impressed. And this would all have leaked out on YouTube and LiveLeak anyway. Might as well get this last bit of awfulness a thorough airing out, and move on.
Trivia: Was Cho "A Boy Named Sue"? Koreans of my acquaintance say that "Seung-hui", as rendered in Hangul, the Korean script, is a girl's name. Wonder if that played any part in his lack of mental stability. I know of a male Korean physician who also has a female given name, and he's nothing but wonderful. So, by itself, surely not. But taken in combination...?