Add my 2 cents to those suggesting a hardened perimeter, making access to the interior difficult enough that the dirtballs go to easier pickings. This includes keeping garage doors closed, tools, toys and bikes close to the house, etc..
Motion detecting light fixtures, deadbolts, and a simple and serious understanding and agreement of what happens when a bump in the night (or day) occurs, who does what, who does not do what....you get the picture.
And I think most of us struggle with the fact that even in daylight hours, in most of our neighborhoods things are no longer like they used to be, so at our house we try to keep doors locked at all times. In all honesty, we fall short of that more than we should.