Why we should not learn from Detroit's sewage system's collapse?

For us, its always like this.  None of our cities have sewage system!!  So, our city planners can relax and chill, and we really have no need to learn from Detroit actually!!!  Because, to learn a lesson you need to have a system, no?

http://wwwp.dailyclimate.org/tdc-newsroom/2013/08/climate-doorstep-detroit-sewage-woes