I don't see what's wrong with asking the police to help protect your house from vandalism, even if you are on vacation. The kind of behavior this old lady's kids were engaged in was illegal, and the police helped solve the problem in a cost-effective way. Where's the problem?
The problem is that it went from extreme no-other-solution necessity to a more mundane use. In other words we get too comfortable with it and pretty soon they could be monitoring everyone. It's not a slippery slope. It's just natural progression.