I agree with the PPs that it's a combination of luck and tree trimming - and what kind of trees you have. Silver Maples and Bradford Pears are notorious for breaking in the wind. In addition to trimming our trees, we also replaced/removed the silver maples. We feel lucky that we had nothing come down but some of our neighbors had some very healthy oak and sweet gum branchs wrenched off the tree and land on fences. Our 'snag' was just fine but it's basically just a 20 foot stump so I didn't expect it to come down and even if it did, it wouldn't hit anything.
http://wdfw.wa.gov/living/snags/