Why don't they throw his fucking ass in jail already?

There isn't any actual thing called justice or law.

Its an abstraction.

Those who are in office decide how and who it is enforced against.

And they interpret it too.

We have social castes in the west.

Because he'd get amnesty / pardon from Sleepy Creepy Joe and go right back to being a hand puppet. The Republicans would have burned political capital and been mocked by the legacy news cycle.