Why would someone want to send me a nasty bad PM? I'm a kid from the Great Midwest who wouldn't hurt a fly. Modest, humble, quiet, unassuming, peaceable, over-educated -- and I'll feed anyone who thinks otherwise their own guts for their last meal.
Seriously, if a threat of real violence was sent to me in a PM I'd turn it over to the proper authorities -- and I don't mean my friends Vinnie and Guido, but law enforcement. If it's just words I'll delete it; if it's repeated I'll inform the mods.