Because there are no locks, and because ND may end up giving them a game.
Think back to when ND played at Louisville a few weeks ago...the Fighting Irish basically outplayed Louisville for the entire game, but couldn't hit their late free throws and wound up getting steamrolled in overtime because of it. In fact, I think that game was the catalyst of the losing streak they're on now. But they consistently had a 6, 7-pt lead throughout most of that game and really should have won outright. It's not like ND doesn't match up well with Louisville.
ND is too good of a team to continue getting pasted by everyone night-in, night-out. Now, I'm not an ND fan, nor am I suggesting you play them tonight. I'm just saying I don't think ND is going to keep losing they way they have been throughout the rest of the season.