If you're interested in keeping bad guys from taking your stuff, the idea is to slow them down. You need to make it difficult, more time consuming, and harder for them to get in. If you lived in a bank vault.... Someone could get in!!!!! Your security should be appropriate to what the bad guys think you have inside. If you can make them think it's easier to go somewhere else, you are ahead of the game. Sure this idea isn't foolproof, but maybe going to get some wire cutters, or bolt cutters is too much trouble.... Too much time where they could be seen. Maybe someone's house down the street is a better option for them. Maybe they are slowed down enough so you have time to arm yourself. This is a cheap option to help keep your stuff for yourself, instead of having the bad guys take it!!!
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From @goathollow