The Trump immunity case is easy. The Supreme Court shouldn't make it hard.

[Igel]

3. Except they can't be.

They enforce nothing. What actions do you punish them for?

At the same time, they (as a justice pointed out, to nobody's gainsaying) enjoy no immunity. The context was that if they can be both arrested and charged and prosecuted independent of any impeachment and removal from office, why should a president?

Then again, SCOTUS is a kind of corporation. Ultimately, it's authority is invested in a majority of the justices hearing a case. It is not, per the US Constitution, the case that "The executive power shall be vested in a President of the United States of America."

Strictly speaking, SCOTUS is set up, by Our Democracy, as a conspiracy. (And SCOTUS packers just want our conspirators to outnumber their conspirators.)