> Say I lay a log on a road which you can clearly see and avoid but choose to drive over and crash your car, that’s prompt injection.

Start laying hazards in the middle of the road and see how quickly the police introduce you to things like “reckless endangerment” and “involuntary manslaughter”. The general social contract is that you don’t take actions with the intent of causing harm to others regardless of whether the victim could have avoided the harm had they taken different actions.