Lawns are lame monocultures, but if a lawn exists it should be mowed.
You could, but it wouldn't be fun.
Who are we to impose our aesthetic sensibilities on others.
Having people cook for you used to be reserved for rich people. Are you emulating slave owning aristocrats when you go to a restaurant?
You haven't seen my lawn. ;-)
My view is that the local people seem to prefer a park with cut grass, and these volunteers are helping them out. If the people want something else, they should decide.
Might it be a meadow instead of a lawn?