I think a special parks unit that can deal with homeless and local populations who despoil public spaces makes sense.  They need not be armed beyond pepper spray perhaps.  I was on my way home at 1:00 am after long hours of work in Waikiki Saturday and was startled by a mainland haole who jumped out of a stairwell.  As a Mandan, I am not scared of angry men and I shouted at him to give me some money for food and the bus!  Reverse strategy.  He could not get a word in with me and he wilted when he knew that he had been had.  Just as he has taken advantage of kindly people out here.  I stand my ground against shibai and so should all of you.