I fail to see how the fountain is an enabler.  Nor, the trees a few years ago.  Do we just level the whole plot to prevent any sneakiness? News flash, no one is hiding anything.  And folks are going to hangout wherever they please.  Besides a motivated overall plan to help people with mental disorders, the solution is more ADP and police walking or biking the streets.  And not to give teens tickets for skateboarding either.