Must be something to do with removing the responsibility for it away from those people who make it. After all, a good moan or complaint makes people think that they are important - complain about the litter, then when the litter is so bad, you can complain about the rats and the smell!
The idea about the clean up at Merthyr is a great one, I'd be up for a few hours bimbling about with a black bag - perhaps if we make a significant improvement, plant a sign saying - "This beach cleaned by BCUK", though if it got littered again in a few weeks and the sign was still there, maybe it would give the wrong impression.
Its the sheeple mantality and follows the story of the four people with an important job to do. They were called Everybody, Somebody, Anybody and Nobody. Everybody knew what to do and Anybody could have done it. They all thought that Somebody had done it, but in the end, Nobody did it!
Ogri the trog