I know what you mean , people will steal whatever they can . The place where i work has a 10' fench with barb wire on the top all the way around the back parking lot . . Someone stole a big walk behide snow blower . They cut a hole in the fence and took it out through the hole . The cops told us the fence is only to keep the honest people out . Maybe a guy setting on top of the building with a 50 caliber would do the trick .