He knew it was wrong. And you are partially correct, with regards to the Saints two QB’s and their families. But the major difference is, the Saints QB’s are tested on a regular basis. And you do not know the personal situation with their familes, maybe having been tested prior to getting together.
All said. What Haskins did, 1) He knew it was wrong, but totally ignored the fact and blatantly committed an act that was against NFL protocol...and 2) There is no way those strippers are under strict protocol to be regularly tested. BOOM!