I've never felt any kind of threat at any campground we've ever been to, anywhere. Several suggestions (above) are good. If you feel uneasy, move! The few dollars you spent on the camp site are not worth it, if you REALLY do feel in jeopardy.
Next, if you do decide to "carry", then one thing you should NEVER do, is advertise it! My sister's boyfriend (Vietnam Vet) is a nut case, if you ask me. He's collected all sorts of hand guns and riffles. He brags about them, shows them off, and then tells everyone he has locked and loaded hand guns in the house if anyone dare approach! I think he's a loose cannon waiting to go off... really! First, he's drawing attention to his armory, which makes him a target for theft. But then, he's setting himself up to get into an altercation too. I once looked at one of his riffles he had in a bed room, picked up up, looked down the barrel sites, moved it around, and THEN he said ... "It's loaded!" I put it down immediately! No thank-you! (and I'm and Army Veteran too!)
What I'm saying is, IF you do decide to "carry" keep it to yourself! Nothing is worse than someone showing off their wares, setting themselves up for theft or altercation! You don't want either!
My strongest suggestion if you feel you are in jeopardy at any campground .... leave ... immediately! And don't turn back! If you have the same experience at another campground, then maybe you should ask yourself "Why?" Maybe there is really no issue with anyone else, but it's an inner conflict within yourself!