Check out the 20/20 report (or maybe it was 60 Minutes) where researchers who hacked into a car brought it to a complete stop on a busy highway (quite idiotically, IMO). Yes, other failures can cause this, but it can still be extremely dangerous.
Referring to an event where nothing happened does not support a ‘very dangerous’ argument. If you simply mean it’s possible and after that it’s then possible that something bad would then happen then I agree.
I am simply saying it’s vastly lower risk than a car that’s impossible to steer or slow down without causing massive mechanical failure.