The police (and other government agencies) WILL want some kind of kill switch or even "drive that criminal into the jail" feature and they WILL force manufacturers to implement it. In most stupid and 'secret' way. Now the trouble is that we see the pattern repeating during last decades: hackers are always ahead of technology and police. So they WILL get access to that 'feature' and then we'll see lots of kidnapping, robberies and other fun stuff. Just stop a victim in dark place and then send him the other way as far as possible. And no, you won't be able to press gas pedal and drive away from that mugger.
A few crimes of this kind on TV and the public will refuse any car with significant amount of intelligence.