People litter the ground with everything. Fast food might be "evil", but this doesn't prove it.
On a side-note, my neighbor is especially guilty of this, constantly throwing his trash on our property. We've now grown a collection of his garbage, and when the time is right, preferably when the trash bag is overflowing, we plan on dumping the contents of the bag into the middle of his driveway. I may not be able to teach the masses about respect and litter, but I will certainly have fun teaching it to my neighbor.