you can't compare the two examples
you've got a someone getting pulled over for intoxication, which is punishable by law. Not to mention, it happens every single day, from the rich to the poor.
then you've got a man who says some horrifying things that while spoken every single day all across the country.....it's never taped and leaked to a gossip website
the reason you can't compare is that irsay's trouble is legal and will be handled in a courtroom. it's not surprising that the nfl hasn't done anything as they are more than likely waiting to hear those results before their punishment. while sterlings was in the court of public opinion, and it couldn't have come at a worse time. they had to make a move, and make it swift as to not upset fans and risk ticket sales and eyeballs on the tv's.
the nfl controls the narrative for their league with an iron fist and the fact irsay's was when it was, and it was so commonplace in the public eye, they never had to risk sales or viewership. they'll quietly make their announcement when his day in court is done, and it'll be on talk radio and tv for a day maybe 2 and then on to something else.