> It's always depressing just casually observing the amount of abandoned tents on the way out

Not just tents, but all sorts of camping gear, carts, clothes, food, gimmics, and so on. Many in good condition. Aside from the waste having to be cleared, it's very wasteful to throw away good stuff.

I am convinced this is a cultural problem indeed. Stuff like a tent or a gas-burner is cheap. Cheap compared to what it cost (in % of monthly income) decades ago, and cheap compared to the ticket and other spendings on that festival.

The cost of a tent (or the costs of some cans of food, some shirts, a funny hat, an inflatable flamingo, a chair) is nothing on the total bill of a festival. That new tent you bought, costs about as much as that beer you spilled when you bumped into that drunk dude.

So, purely economically, it makes sense to just leave it behind. Why carry your (now dirty) tent, food, cloths, etc home, when you can leave it, have a more pleasant return trip, and just buy new stuff next year.

I think this is a very good analogy for why we are unable to stop ruining the world in an ever increasing pace.