I guess that's the simplest one that a self-driving car's software might not approve of. Or intentionally collide with a kidnapper's vehicle, or just make a prohibited turn or run a red light to try to escape.

These scenarios are kind of vague because they don't make it clear whether the self-driving car lets a human driver take over and take full responsibility.

I think a human would drive over a kidnapper. Say your car is bullet proof. A man in a ski mask wielding a machine gun jumps in front of the road and orders you to stop. You refuse, he starts shooting at your car as you get near him (this is why I made your car bullet proof, to keep you alive but unequivocally demonstrate clear and present danger to you). In such a scenario, if your only escape route is over the dead body of the man in a ski mask, I bet a human will take that option.

Manslaughter is a likely situation that needs to be addressed in the next Tesla OTA update.

Wow, where did the machine gun come from!

As this is happening in the future, the gun was probably 3d printed by the kidnapper.