I don't know about Antifa or BLM in general, but anarchists and ancoms generally avoid having to consume and rather build alternative economies and services. As such, they are often targeted by law enforcement. The perception is that they are being protected, but that is propaganda, it's what you were allowed to see. Dig in a bit deeper and you will see the hidden animosity that is present between the US government and the radical left. They wish to bring them down, and the US gov is certainly not stupid enough to not take them seriously.