They also didn't win because they called a pass on 3rd and 1. Yes, Goff blew it, but this was also one of a few key decisions the coaching staff made that were overly aggressive that backfired.
Everyone knew that Washington's run defense was its weakest link. Though Montgomery was a little rusty early (and the staff was overly aggressive in letting a rusty Montgomery open the game), there was no reason not to let Gibbs put pressure on Washington's run defense early and often.
Campbell's aggressiveness has made the Lions a much tougher opponent. Sometimes being aggressive for the sake of being aggressive is not the right play, and it wasn't on that play. They spent the whole game trying to come back from it.