Campsite/Campground Theft

I read quite often in this forum of people securing anything that weighs less than their RV to deter theft. It is a shame if this needs to be done and I am wondering if theft at campgrounds is as bad as some lead me to believe. I only have a couple of seasons under my belt and I have never been a victim -- I have always left (thief-desirable) things sitting outside, under my awning, sometime for the whole day, without even thinking that somebody at a campground would be so low to steal them. My friend, who has as much/little experience as I do, locks up everything or puts it inside, and I have always thought he is a bit paranoid, but after reading these forums, I'm thinking I have just been lucky.

I have always had the feeling that people at campgrounds are trustworthy and "part of the family" and would never violate another family member. How wrong am I?

Bruce