Do you think that they aren't participating in the insurrection? The presidential immunity question should be enough to answer this for you, before even considering that Thomas' wife was actively helping coordinate J6.
There's a coup still underway and SCOTUS is right at the front of it.
Are you serious? You didn't think that you're splitting hairs a bit?
"Yup. We have to let them go. Sure, they overthrew the government, but some pedantic arse said they need to be directly involved in violence, not just undermine democracy from the bench, in order for it to count."
Yes. Coup plotter sympathizers, too. Don't forget the coup plot. The insurrection was more exciting to cover; the coup plot was (and is) the real danger to our country.
Alito and Thomas have been biding their time on the Court, waiting for the 50 year conservative project to come to fruition, and now that it is they're no longer willing to play pretend as objective neutral jurists. Their argument is simple "we won, we can do whatever we want".
They’d be willing to pretend if they had to, but now there’s no need.
Unless a super majority were to get elected to congress, that could either impeach them or at least pass laws governing their emoluments and conflicts of interest.
Just need a trifecta with a spine to kill the filibuster and pass laws. Or some executives with balls of steel to take the fight to the court and flex their own power in the law-enforcing part of the equation. They aren't omnipotent determiners of law.