"Let it put it this way. Suppose your neighbor's was on fire at 2 a.m. and you noticed it. Would you warn them? Would you call, beat on the door, call 911? Of course you would. What would you think of the neighbor who didn't?" I did that once. I called my neighbor next door at 2am and told them their house was on fire. Naturally, they freaked out and fled the house. Once outside they noticed no fire - no flames. Not even any smoke. The guy went back inside his house and rang me back - said I was a prick. He's much closer with his neighbor across the street who doesn't behave like an ass.