The Poop Painter of New York City

Here's a video filmed by a tour guide in New York City showing what one vigilante is doing to highlight poop left behind by irresponsible dog owners.  I was going to say literally highlighting the poop, but the person is using spray paint (not a highlighter).  The video was posted by tourguideStan, who runs a pedicab in NYC (www.oconnorgreentoursnyc.com).  I'm sure someone whose livelihood involves walking around the city all day has a vested interest in keeping the streets clean.