Saying you're too lazy to actually check if these videos are genuinely all black students, but someone could do it, and you know the answer even without checking somehow, isn't exactly convincing.

There just aren't enough blacks in the US for them to completely dominate any crime. To be at your imagined rate of 90% of instances being black, when only 13 or 14% of the population, would require a ridiculously high rate compared to every other group.