"I don't know how to do this" is not the same thing as "this thing can't be done".
"How would decisions get made? How would we deal with unsafe people? How do we avoid 'mob justice'?" All valid questions. But think about how we tend to do things now...are you really convinced that it is functional, equitable, and sustainable?
We all know it is not. Look at where we are and tell me this way of organizing society makes sense and is the best possible thing. Say it with a straight face.