the common denominator isn't Michigan... we don't pick fights when we lose; as noted BOTH Oregon and Texas did this in Michigan Stadium, and no one in Maize and Blue did anything to them, we just shook hands and walked off the field.
If there is a common denominator, it's OSU and MSU, two schools full of idiots who couldn't get into Michigan, who've decided to base their existence on beating Michigan in football, and can't handle losing to the Wolverines, and act like morons when they do.
As far as this being "100% on uofm players, no question": here's the video of how it actually started:
If I'm holding a flag, and you run up and shove me, who started the fight? Me? Don't try to claim other people have the "thug mentality"....
There's one undisciplined team there, and it's the one who's coach stood idly by with a blank look on his face, while one of his team leaders put hands on another member of his staff, and his players stormed the field to pick a fight, after losing as 19.5 favorites on their home field...