Try telling a cop or judge “yes I was speeding but lots of people speed and get away with it, why shouldn’t I”
If the law is being selectively enforced due to a pre-existing bias, you’d better believe it is supposed to get thrown out in court.
If a 65 mph speed limit was normally not enforced until 72mph, but it was shown that a particular minority group was routinely given tickets at 68, wouldn’t you object? It would be legal abuse.
This is what’s happening here, but the bias is political not racial.