Shame what they did to that park.
The facts are simple...people who litter are simply lazy. Nothing more. They throw their trash wherever it lands rather than caring for it properly.
When I lived in Eagle River, the school bus stopped right in front of my house. The kids got off, took their drinks cans and such and just threw it in the front of my yard. I filmed this secretly with a videocam.
After about a week or two of this, I carefully watched which homes the kids went into. Then later I went on knocked on my neighbor's doors and spoke with their parents. Most of the kids owned up to their poor behavior and that was the end to it for them...they quit doing it, which is all that I asked. Three of teenagers denied they did it at all. I remember one parent saying, "If my son said he didn't do it, then he didn't do it!" At that point I handed him a VCR tape to watch.
Egg on face, the 3 sets parents had the kids cleaning my yard for the summer, mowing it and everything for free.
I actually got to know those kids, gave them sodas and such to drink while they worked on my yard and we all became friends. The next year I paid them to mow my yard. If anyone got off the bus and threw something down, the other kids jumped on them and the trash was picked up immediately.
The point is that some people's behavior is directly the product of parental upbringing, or the lack of it.
On another point, back when I resided on the military post, they installed thermostats that automatically cut off air conditioners to reduce power consumption. They set them at 81 degrees F. It was hot in Mississippi where I lived, mid-90s in the summer. And 81 didn't cut it for me. Stupid mercury switches can easily be bent and adjusted so that while the thermostat thinks it is 81, it is in reality 72. I stayed nice and cool.