The giant party just dumps their trash in the Reno Sparks area on the way home. Search for burning man at /r/Reno if you don't believe me
This 100%. They only care about their playa. As soon as they are off, their considerations go out the window and they trash every other town they want to.
There are some shitty Burners and those cause the most visible problems, but there are a lot of conscientious ones too (I think it’s the majority of them). Painting them all with the same brush isn’t quite right, a lot of us work hard to do things the right way (like spending hours in line to pay to dump trash at the Reno municipal transfer station). I don’t know how to get the shitty ones to do the right thing though, besides lots of public shaming. It’s hard to avoid having any jerks in a city of 70K people.