Why are my parents so bloody adamant that about ninety percent of all knife-crime in Edmonton's black-on-black?

Oh, and apparently, that goes for places like Tottenham, Bruce Grove and Seven Sisters as well (!) Apparently, nine times out of ten, whenever there's a stabbing down in Edmonton, or any of the other aforementioned places, "It's nigh-on always a bloody c**n who's to blame!"- (my mum's and dad's words, not mine, so please don't shoot the bleedin' messenger!) In fact, it's "bloody c**ns" this, "bloody n****rs" that, and "bloody P*kis" the other, with them, and like I said before, they're absolutely adamant that about eighty-five to ninety percent of all knife-related crime in all of the places I've mentioned, is black-on-black, and that I've only got to read The Enfield Advertiser or The Independent, in order to see that they're right, and I'm sorry, but I, for one, think this is absolute bullshit of the highest bloody order! Why are the buggers so bloody ignorant? Who agrees with THEM, and who agrees with ME, that they're ignorant, AND, more to the point, wrong? Come on, fellow Londoners- please get behind me on this one, and let's prove my mum and dad wrong once and for all! I'd really appreciate your angles on this one, please, guys. Much obliged! Peace and love! Be lucky! :)