Depends what sort of bears you have near your campground! I've seen plenty of black bears come through campsites and it never worried me - they're cowards. They always run off when they realize there's a bunch of drunks sleeping off a hangover in the tent they're sniffing around. Usually they'd come by in the mornings and leave as soon as they hear us waking up.

If you have grizzlies, however? Yeah, that's pretty goddamn terrifying. I already feel a little exposed when camping without a gun, but you better believe I'd buy one if I were camping anywhere near those monstrous cuties.