The Mulford Act (https://en.wikipedia.org/wiki/Mulford_Act), a California gun control act that prohibits open carry, was originally passed back in the 60s to disarm the Black Panthers.
The Supreme Court is unwaveringly partisan and corrupt; its members have taken bribes and invented new rights for Trump to keep him out of jail. I wouldn't assume that they'd reject a dictatorship.
I think it's premature to rule this out. Trump has previously abused government agencies to harass his opponents, so why wouldn't he and Musk use IRS data for this purpose?
Elon screws his partners in business deals, cheated Twitter employees out of severance, and is currently destroying our government. All of this trumps a firsthand impression from Dawkins.