So, the baby in the stroller won't get a $1000 ~vagrancy ticket, nor the parade watchers 'saluting the flag'- how American.  What about the kids who spent the day at the beach and are waiting for a ride home?  
There are working poor, working homeless, the mentally challenged and folk who have just had really hard times with no idea how to recover.  They cannot be all just swept away; they are our brothers & sisters- we all are brothers & sisters.  
How about providing training and infrastructure to help them be on the road to self-sustaining?  
 Help provide tools to grow food and form a 'community'.  Basic training & resources (clothing, health checks etc) to become employed.  With unemployment at record lows, employers should be open to helping and searching outside their normal recruiting pools. 
On Hawai'i, the big concern & spend was security.  CB covered this well- $900/person/month with security, ~$300/person (excluded).  Longer term safety solution should reduce the spend.