Car Bombs + self driving cars is going to be an utter shit show.
They were extremely effective in combat, and called the "poor man's cruise missile" by analysts. Here's a video of a strike; note that they were often used in as the opening salvo of combined arms attacks. https://www.youtube.com/watch?v=AZBAU_TTZ-4
Of course there’s an aspect of their ideals that glorifies suicide so maybe they’ve already thought of this but just prefer to keep the suicide route.
Self driving cars already have everything required to control the car built in. They just need to hijack the existing controls and hook it up to a RC system (or just tell it to drive to location using internal controls).
I’m surprised someone hasn’t hooked up a remote control interface to an existing car.
This kind of stuff was done in the Daemon/Freedom sci-fi books, which are entertaining and becoming concerningly less fiction with every passing year.
That’s not to say it won’t happen (Uber) but it shouldn’t.