Ban Albertans from BC campgrounds?

The last time we were in Alberta, we stayed at the Big Horn Dam, west of Rocky Mountain House. We had a great place to camp with my two older kids and a friend. We dry camped for 3 weeks. There was a nice fire pit and room for 3 TTs and my 5th. We kept it clean and left no garbage. My son in law went back about a month later to the same spot because it was so nice. He found the fire pit had been destroyed, tin foil had been ripped up and spread all over and garbage was left. This place is owned by Alberta Hydro. I can't remember the proper name. They don't charge for people to use their land but if people continue to do this, they'll ruin it for the people that enjoy the place and clean up after themselves by charging a fee to stay there. This is not to say this is only common to Albertans because it happens all over. We usually dry camp in northern Michigan, in a state forest and you can not believe the garbage we find there. People up there use it as a dumping ground for junk, fridges, stoves, etc. It's a bloody shame.