This crap will continue until those who currently favor it see that it’s a very bad idea. That can be achieved without the extreme measures you are proposing.
The “extreme measures” that I am proposing would not be extreme if CA actually attempt secession. Civil wars get ugly real fast and the quicker it’s over the better for everybody.
What's extreme about repelling invasion by force of arms?
Or firebombing legitimate targets which have come under enemy control?
Was Sherman's March to the Sea extreme?
Most of the Southern members of my family think so. But Northerners and some Southerners think not: they think it was a rescue that ended the War quickly.
California has become a danger to humanity precisely because it undermines America: if America is not there to rescue Humanity, then who? Mexico?