"if it's not your property leave it alone."
First off, I'm hoping your post is just a rant and not actually directed at MM members. I'm guessing that's true because I don't think anyone on here would steal someone's tent or camp.
Second, I have an equally powerful statement for you:
"if it's not your property, don't leave your stuff on it". I'm afraid the days are long gone when we can expect to leave our camps and equipment in the hills without having someone possibly take it. It's a sad state, but if you leave your property on public land, there is always a chance someone will do some window shopping.
I'm sorry for the loss of your stuff.
"Therefore, wo be unto him that is at ease in Zion!" 2 Ne. 28: 24