Witness "gallows humor", the sardonic humor of the old Soviet Union's publication Krokodile (sp?), etc.
Hell, I've had my co-religionists tell me concentration camp/pogrom jokes that were actually funny! (Yes, I lost family in the Nazi genocide.)
Besides, "rap" is the signature "art" of black urban America - a CORE DEMOCRATIC constituency if ever there was one. We may joke about this idiocy, but FReepers ain't commiting the atrocities.
Reminds me of a good point one comedian made about the drive-by shooting craze...
"It ain't being done by carloads of elderly folks going to Bible meetings!"
Not sure, but I think it was George Wallace.