There is no “legitimacy crisis” for SCOTUS.
There wasn’t when Democrats seated several hard-left justices.
There isn’t when Republicans seat several hard-right justices.
Elections have consequences; accept the outcome of elections.
Demonstrate as you like. The only factor that matters is electing representatives, and petitioning them to represent your preferred views. That’s how this system works, and keeps the peace.
Don’t go to “mob rule”.
One mob largely demands, and submits to, arms prohibitions.
Other mob largely rejects, and often ignores, arms prohibitions.
Let’s not go there.
There is no “constitutional crisis” brewing.
Legislated due process is followed.
Don’t like the balance of the court? advocate election of representatives who, when a vacancy arises, will seat someone of your liking.
A “constitutional crisis” only happens when X occurs, and the Constitution simultaneously deems it can _and_ cannot happen.