Well, you know, everyone fits into boxes and has the most predictable behaviors. Like how all non-conservatives love Burning Man and wish they could all go and get sandy and naked.
Aren't there slab cities in the desert that are just filled with all kinds of junk?
Really, I'm not passionate about defending the Burning Man event or people, but it seems like in every other way but this, they are very conscious of their footprint, leading me to believe that this is a consciously different thing not a hidden hypocrisy. Don't they have some big cleanup party the day after? Thought I heard about this and figure this is when that picture was taken...They even got a special name for the trash...have to look it up....
But maybe they are just "slipping" and getting as lazy and polluting as everybody else? If so, bombs away with your sanctimony. If so, then I am misguided in thinking otherwise. Entirely possible.
If that pic is viral, which is likely, maybe the ethos will change.
Editing in: I found this page but there is no mention of bicycles...
https://burningman.org/event/preparation/playa-living/trash-recycling/