I don't think I can call the stomping play a "dirty" play... it was just so blatant and so... unplanned. Dirty to me feels like something you try to get away with and you choose to do. Like eye gouging at the bottom of the pile. Or maybe aiming high or for the head in a tackle, or diving at a QB's knees to break his legs.
Not that Suh didn't choose to stomp the guy, but it felt more like he just has anger and rage issues.
Nebraska obviously didn't instill humility in their lineman, which doesn't surprise me.
This guy has enough talent to just walk on the field and perform, unfortunately he isn't one of those athletes who views this gift as a blessing and treat it with respect.
He needs to keep his temper in check.