It's mainly around making your house less attractive to being burgled than your neighbours as told to me by the police when we got burgled. So probably the alarm (though most people ignore one that has gone off), CCTV they all wear caps and hoodies anyway so it is debatable. But if you leave your windows open then either way you are more likely than someone with locked windows. But if you have both and a few doors along doesn't guess who is probably more likely to be targetted all things being equal.