How do you feel about people walking through your campsite?

We've rarely had this happen, but on a couple of occasions we just rearranged the table and chairs to make it a lot harder. Some parents obviously missed teaching their children the "manners" class - or never took it themselves - and DH just quietly and inconspicuously said "walk around" and continued on with his reading...the kids didn't come back through. On the flip side, we've enjoyed some very nicely taught children who would stop at the edge of the road and ask if they could come in and pet our dog. Never had this happen with adults.