I can't recall seeing this happen to a young white man either, not saying that it doesn't it would seem that if it did happen it would definitely be national news.

Hmmmm not sure where you are getting your stats, but I found this:

Poison Murders by race

White: 79.8%
Black: 18.4%


Arson by race

White: 55.7%
Black: 42.0%


Sex related murders by race

White: 55.7%
Black: 42.0%


Gang related murders by race:

White: 54.3%
Black: 41.2%
(I hope the irony is not lost on you)


Infanticides by race:

White: 55.4%
Black: 42.1%



Eldercide by race:

White: 54.5%
Black: 43.8%


Multiple victims by race (I assume this includes Serial killers)

White: 55.7%
Black: 40.8%


http://www.ojp.usdoj.gov/bjs/homicide/race.htm