I don't see any reason why law enforcement with a warrant or probable cause couldn't
But that's a stretch.
So we're arguing degrees here. The difference between remote hijacking and all those other already-implemented safety features you've mentioned is that the latter assist the driver, not some external body who insist that they're doing it for our own good because they can decide better than us what that is. If you haven't guessed, I'm also against Trusted Computing(tm) and all the rest of that SecureBoot bull.
and as usual, those capabilities were introduced for convenience
The question is whether it's safer to do your own driving, or trust the programmers to have designed the AI sufficiently well to drive better than you. Drivers are pretty bad in general, so it may be a bit of a toss-up.