Thieves in the campsite

Would you believe that we have encountered thieves in a campsite? Worse, the campsite is operated by the government so we were too trusting with the place. It is a picnic site and not just a campsite that's why it is crowded during the daytime. It was a family camping for an overnight stay in that campsite. My parents were there together with 2 of my siblings and their families. Come night time the people left and it seems that we were left alone. It was great to have dinner even if there was no moon. In the morning when we woke up, our pots with the leftover food were gone and sow with some of our belongings. We were all asleep inside the tents that no one had heard of the intruders. Maybe that wouldn't happen if we had brought along our dog.