So a Trump supporter smashes Offset's car window, but the cops reach into the car, pull him out, and arrest him.

The police actually witnessed the Trump supporter smash in the car window and did nothing.

But a separate Trump supporter merely claiming that Offset was waving a gun at them was enough for the cops to stop and arrest Offset. https://variety.com/2020/music/news/migos-offset-cardi-b-detained-by-police-trump-supporters-1234815009/

Offset was later released without charges.

A passenger was charged with carrying a concealed weapon, which doesn't mean he was guilty. It also certainly doesn't mean he was waving it at anyone.

AND apparently the person who initially claimed Offset was waving a gun at them says they now don't want to pursue a complaint. Interestingly, the passenger was still charged and bail set.

Funny how in all those cases where people drive cars into protestors, police say they can't go ahead if they don't have a complainant. But here they somehow are doing fine without one.