cops target all cars out after 2am......that is part of the job....
Exactly, at that time of night, if you are doing anything even remotely suspicious (which being stopped at a green light is), then you are asking to be pulled over.
i got pulled over about 10-14 times during my junior and senior year, i worked a second job nights at a gas station and was often out driving near campus at 4-5 in the morning.
Never got a ticket or warning, just a quick how do you do to see if i was drunk or not and a "have a nice night"
I guess that was profiling, but i honestly didn't care ro think about it that way. seems to me those who do are afraid they'll get tagged because they are in fact breaking the law

EDIT: yes, quite sure its illegal to stop for a chat in with another car in the middle of the street on a green. basic traffic law.