Every time I bring up the built environment with planners, almost all of them say "it's not our fault." They blame politicians, etc. for the results of the pla

Every time I bring up the built environment with planners, almost all of them say "it's not our fault." They blame politicians, etc. for the results of the planning profession over the past 50-70 years. Perhaps the planners are right, but then my question is, what do planners actually do?