In my neighborhood, I’ve noticed that there is a lot of litter after trash day. It isn’t people throwing stuff out of windows, it’s trash blowing out of the trash truck or fluttering out while the cab is being dumped, etc. I make it a practice to police my curb and those for my surrounding neighbors if I see anything, but if it blows away before I get to it not much I can do.
Hopefully that brings back a little faith in your fellow man.