There are well over a dozen basic road rage scenarios.

Most are due to actions (or inactions) of the "victim": deliberately cutting a faster driver off from passing, brake checking, misuse of the horn, shouted insults, offensive gestures... which they then proceed to escalate.

Sometimes a road rager is just crazy and seeking a random target, or they hate your bumper stickers, or perhaps they misidentified your vehicle as belonging to someone else... but 90% of the time the "victim" started it, yet assert they were targeted "for no reason."