I've never seriously considered installing cameras outside my house, and the #1 reason is that I don't want a reason to fear something when there's nothing to fear.
I've never had my home broken into. But I guarantee you there have been all kinds of suspicious-looking things happening outside of my house. Someone's probably looked in the windows of our cars. Hell, I'm sure folks have wandered into (and out of) our gated back yard. Nothing's ever been stolen or disturbed, and while it would still be trespassing, it's not hurting me. My life would be worse, rather than better.
Maybe I'll sing a different tune when my house gets broken into some day, but for now I'll be blissfully unaware. And what would the video do for me, anyway? It seems the news is full of video clips asking people to call the police if they recognize the person. And what? Usually, nothing.
I live in the bay area, and have never once worried about package theft. I think homogeneity is probably the biggest predictor of it. Live in a multi-generational neighborhood? No problem.
Live in a cookie cutter subdivision with one way in and out, and every single resident is gone all day? Package theft heaven.