I was shocked ten years or so ago, when mine returned from festivals and told me many others set fire to their tents and abandoned their wellingtons. I now accept it as a frequent occurrence but I remain shocked that expensive items can be discarded so easily.
When two of my children did the year out travelling thing, they found one country so expensive and hostels difficult to get into, that they bought a tent. When they moved on, they found a homeless man in the nearby city and gave him the tent and other usable things. I genuinely don't understand why festival goers can be so senseless. No doubt some of them will be involved in planet saving activities !