Why are security guards usually such creepy losers?

Everywhere I've ever worked, the place is always "guarded" by some skeevy security guard who thinks he's a whole lot cooler and more important than he is. Usually it's either an old guy on a power trip who's way too nosy, or it's a young guy who goes around telling everyone that he's right on the cusp of becoming a pro bodybuilder, right after he gains about a hundred pounds or so. I think they either know they're losers and lash out at the world for it, or they're genuinely clueless and really do believe they sit atop the local food chain.
Why are security guards usually such creepy losers?
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