Trash...what have we created?

Every late afternoon I go for a short walk through a nearby park. The main path I take adjoins a cyclone fence belonging to a large primary school.
Running parallel, about 4 metres from the path, is a small shallow creek.

Being a ‘grumpy old lady’ who worries about the environment, I always take a bag with me on my walk and collect bits and pieces of rubbish that litter the pathway and surrounds. Sometimes there’s a lot, at other times only one or two pieces. The picture accompanying this is from Fridays’ walk.

On a windy day there is always more – and some bits too hard to catch!

On the school’s side of the fence, the rubbish in some places is ankle deep.
There are several concerns presented by this situation:
One worry is that so many children are obviously eating packaged snacks – snacks packed and sealed in plastic, that not only present a litter problem but (to me, anyway) displays a lack of decent nutrition. (But, I guess, that’s none of my business).

The small detail that the children seem unable to contain their cast-off packaging is another concern.

Also, while these packs may be convenient for busy parents to pop into lunch boxes, they must surely be a drain on household expense (?)

But the other, possibly main, worry concerns the fact that most of these little bits of trash will end up in the creek, which will swish them further along the waterways, ultimately ending in the ocean.
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My walk, and my minuscule rubbish collecting, is hardly going to make a difference to one of the huge environmental problems besetting the world today, but I simply cannot bear to walk by this sort of almost innocent-looking rubbish.
So, I guess, I’ll keep doing it.
I have no answer!