It’s not all about plastic. I find these ring pulls all the time by Loch Lomond, more than 30 years after they became obsolete.
It shows that the lochside has long been a magnet for stupidity, it’s not all about a sudden influx of car carried stupids the past few years.
Maybe you can’t educate some folk to see what they’re doing wrong or get them to care about it.
One of my worries was a mile away from this photie where the Park were charging folk to camp on a manky badly angled patch of scrub at Firkin Point. If they charged me for that I’d want to throw litter and burn my tent in the morning.
Maybe treat people better and they will care.