Jakob, I haven't looked up your link (just yet) and I'm not sure I will do anyway as, no doubt, it'll only raise my blood pressure reading it, and the absurdity of convictions for road traffic crashes caused by car drivers, or rather, the leniency metered out.
Nowadays, we live in a world where people (given the chance) will say: "Not my fault!", when clearly it is. So unless you are able to produce video evidence, or an independent witness(es), scumbags will try to get away with it and, judging by your comments, be habitual.
Friend of mine was recently walking his dog over the local municipal golf course early evening, and went past 3 schoolkids (girl and two boys about 15-years) sat on one of the fairways, eating crap food/drink (obvs), and tracing his route later, went past them again just as they got up to walk away. Yep, they just left their rubbish. So he challenged them about it. "It's not ours" they said. It was the girl who was all mouthy, saying 'this-and-that' and calling him a 'pedo'. Scumbags aren't they? Eventually, one of the boys went back and picked it up. After my friend was several hundred yards away, they shouted to get his attention, two fingers raised and threw the rubbish on the ground. Scumbags – confirmed!!