I don't lock my car or my garage for this reason. None of the security on my car does anything to stop a cinderblock, and that's the likely attack vector. I live on the border of the west side of Chicago --- a very high-crime area --- and garages and cars are busted into all the time.<p>A couple times it's been clear that someone had been in the car. But I've never had my garage door and car windows destroyed.