You know Robert, from reading your blog, you don't seem to enjoy RVing. Maybe the reason your not meeting any friendly RVer's has more to do with your attitude than theirs. Unlike you, I have met mostly friendly RVer's, and have had made some lasting friendships. We have had several RVer's stay on our property when they were passing through.
I think the fact that you come into your campsite late at night, do your hook ups, leveling, etc, may be one of the reasons your stuff is disappearing. Something to consider, eh
Oh, and I believe no one has the right to steal anything from anyone, no matter how they may have been provoked.