Marquette's 3-2. They've beaten the Presbyterian Blue Hose, the Bethune Cook Wildcats, and the U of Maryland Baltimore Golden Retrievers and lost to unranked Indiana and #2 Kansas. IOW they've beaten no one and lost to everyone. Would you prefer that SJU was 3-2 with that schedule or 5-0 with SJ's schedule.
You're only looking at the game that have been played to this point. If you look at the overall schedule, it's not even close that Marquette has the far better schedule. Of their 13 OOC games, they have 7 gimme wins, 3 toss ups that would be considered good wins, 1 should win that would be solid, and 2 likely losses where they are essentially freerolling. That's pretty perfect. Them beating Buffalo would be a better win than any of our first 12 games. And that's their 5th or 6th toughest game.
On KenPom, which everybody including the committee looks at now, we dropped 5 spots since beating Cal + VCU. Marquette moved up 1 in their loss to Kansas.
Again, these coaches and ADs have their jobs on the line depending on their program's success, almost all of that revolves around making the NCAA Tournament for major conference teams. If the easiest way to ensure success was to load up on easy wins then everybody would do it. These guys wouldn't be risking their jobs by scheduling good teams if that wasn't the optimal strategy.