The only time my neighborhood had a rash of burglaries was after a big storm. Lots of people got their roofs replaced. Many of the roofing crew members seemed unduly interested in what was in the back yards around their work sites.You might know all you neighbors, but there's also delivery drivers.
Within about a month, almost a dozen homes had been burgled. That's almost 10% of the neighborhood.
Yeah, no2gates has a good point about worrying about non-neighbor snoops.