I think the majority of people are neat and don't litter. If they did, things would be vastly worse.
I don't think this sort of thing is ever going to go away. It's likely some younger people just being a bit rebellious and acting out. When they grow up and stop the nonsense, they will be replaced by more that will act out for a few years and so on.
I recommend not letting it get you down; chalk it up to immaturity/teen angst and assume the guilty parties will be victims of the same sort of crap later in their lives.
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