PKE transmitters given to firefighters with some mechanism to cycle private keys on autodriving taxis weekly.

Nowhere near perfect, but that makes it a lot harder than just getting a spike strip or a hand gun or a demolition derby car. We’re talking about people willing to risk a decade in prison to “do criminal things to a car and/or passengers”. How much work do you think they want to put into disabling a car with a remote? Why not just wave a gun in the driver’s face at a stop light?