I remember when we first parked up just down from Vatersay Village Hall, Outer Hebrides. Left next to a bin was what looked like a fair size tent and other camping sundries ( have a picture of this). Camping tourists who would be taking the ferry back to Oban, and could not be bothered taking their camping gear back to mainland to dispose of. With hindsight, they could have left it packed neatly at the village hall with a note stating, donating to a an island group, but no, just dumped. This was 2013 or 14, so not new this dumping whatever.
Same for disposable BBQ's. Loch Morlich, left to smolder along with the day trippers other rubbish, I dealt with the smoldering BBQ and rubbish. Kingsbarns, smoke coming from a rubbish bin at steps down to beach, some absolute moron put the smoldering BBQ into the bin, which I put water on to dowse. In the morning I caught the Fife council guy who arrived to empty the bins to warn him the bin contents may spill out and to be careful of the BBQ wire. Which he was grateful for.
If you could understand why individuals behave this way, you would be just as bad as them