Well we get close to bath houses but for different reasons, we don't go in bath houses; like we don't go in public restrooms when we have our RV. When possible we look for a site that is not too close to next guy.
I want to add that I believe it was on this forum a while back where one RVer had his sewer hose stolen
I don't thief in the area will limit to just bathhouse proximity although let the Park Ranger tell you and they would say the majority of sites are reasonably close to a bath house.
We don't ever leave anything outside and we barely use sewer or water. Our Shore cord is locked in electrical bay while the other side is locked to the pedestal.
With all that said, we have never seen homeless or vagrants around a campsite. I think if I did, we would unplug SP and leave, just like we do when we see a large loose dog running free with RV owner that has that my dog is special.