My instinct usually is to help people. But I would resent having to leave supplies behind because my neighbors chose not to buy and maintain their own vehicle.
I'm willing to spend quite a bit of money on preparedness, but if I lived in a city where a car wasn't normally needed, I don't think I'd buy one just for use in emergencies. I wouldn't condemn others for lack of a car, either.
As others have said, having 30% more cars on the road isn't going to make evacuation by car any easier. If you can get out early enough to beat the rush, you probably will also avoid people wanting to hitch a ride.
On the general subject of charity: efficiency is the enemy of resilience. If you only have just enough resources for yourself, then you are vulnerable to the unexpected. If you plan to have enough spare to give some away, then you have a safety margin.
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