If someone wants it bad enough, they are going to get it. Everyone in my neighborhood knows I have a nice bike and that I keep it in the garage. It's really not hard to break into a locked garage and cart everything out into a truck. Hell, I've walked into peoples' houses before when they were home and stood behind them while they were watching TV and they never even looked up. I wasn't there to take anything. In one case I was looking for my date's house and accidentally walked into an identical house one street over. In another, I was checking out a rental house and was unaware that the previous tenants were still living in there. I contemplated jumping out and yelling "HELLO!" but thought better of it and backtracked and left.