I’ll answer:

They are capable of doing it

The spectacle is important to them, and most of them would prefer not to if possible (in my subjective judgement)

Since they are at a point where they are resorting to violence after failing with the media and the justice system, they will start trying as long as it cannot be credibly traced back to them (which would be a huge disaster)

Imagine what would’ve happened if we knew real time that JFK was killed by the CIA - they can not conduct business that way