They are a deterrent and work to prevent impulse theft or other idiocy. If a couple of teens break in for a quick score they probably won't have the tools, dedication or experience to get into or carry off the safe. If you get some real hard core thieves then it would take a pretty solid and expensive safe to do more than slow them down. I look at arguments against inexpensive safes kind of like arguing that you might as well leave your car unlocked because a thief can just break a window.