Real answer?
The American approach to law enforcement largely started out from slave-hunting, and as it's evolved it's never strayed from from the purpose of enforcing rigid social divides more than pursuing even-handed justice. Trump's a rich white guy; the law isn't supposed to apply to him. Certainly not in the "slap the cuffs on, give them a rough ride downtown, and toss them in a cell to die of their head wounds" sense that's increasingly normal for everyone else.