This cop probably thought he was cleaning up the creek by cracking down on rock stacking... but that was his mistake, because rock stacking is an art form performed and enjoyed by everybody in Boulder, rich and homeless alike. Hence the quick reaction from city council in this case. Now if that cop had harassed a homeless person for using a blanket at night[1] , then there would have been no outrage and city council would have backed up the cop.

1: http://americancynic.net/log/2015/1/1/eight_outdoor_homeless_deaths_during_2014_in_boulder_co_where_it_is_illegal_to_use_a_blanket_for_warmth/