The term "stochastic terrorism" is interesting, and worth a moment to read about.
I've been noticing this as a trait in common of a lot of fascism-alike political figures in our era—probabilistic, indirect, speculatively coordinated violence. They aim to (often deniably) activate someone's damaged imaginary and see what springs up.
Obviously IS would be the reference point, I'm not sure Trump's remark about "second amendment people" fits the bill.