State courts can carry out arrests and penalties themselves without federal government involvement
Primarily in the context of Musk that's going to matter with his active cases in the WI court
Other states governments can extradite him too even if he never steps foot in Wisconsin. He'd have to basically never go anywhere other than federal territories or deep red state to avoid that. That's assuming they'd block his extradition in the first place which is quite rare to begin with
Plenty of states are directly rubuking Trump right now and actively going against what he's telling them to do. We don't have to imagine them enforcing things that they don't want. Many are already doing just as much
Statewide dem parties have been better at standing up than much of the national dems have
NY still has the congestion prices going despite his demand they pull it
Maine's governor is not bowing to Trump's demands on trans rights even after direct in person confrontation
And so on