Are you responsible?

[possibletarian]

If someone steals your car - and runs over someone and kills them - are you civilly or criminally liable?

Should you be?

I would say No, and No

I don't think even if you left your keys in the car that you aided the thief strictly speaking, the decision to take what was not theirs was entirely their own.

I can see from an insurances perspective though that leaving keys in the car could be seen as not taking all reasonable precautions.