Not that it's much less embarrassing this way, but... why would you assume they chose people from a counter-terrorism division to go after a graffiti artist?
Fair point, seems it's called "NYPD Intelligence Division & Counter-Terrorism Bureau" - I'm clearly no expert on NYC police!
Intelligence Unit may include counter-terrorism duties, but they are also involved in surveillance of organized crime, robbery suspects, and witness protection, among other things. (Though these duties may differ from city to city).
... and the guy who tried to turn himself in for spraying a graffiti it appears.