That's true, but you can't always consider things as isolated events. I know this is close to being political, but demonstrations almost always result from events that most people cannot influence and the frustration that results from the impotence. Apparently coaches can't even criticize officiating (publicly anyway so that fans know at least there's an effort); what stays hidden looks to be ignored. Maybe the game officials have been warned about the fumble that didn't happen, but the party line is that their judgment was appropriate. I'm not sure how you qualify stopping someone's forward movement when he was in the middle of a trick play and had no forward movement, but ...
The boos were getting louder and the middle fingers more prominent with every Ole Miss player on the turf. The officials are definitely walking a fine line - player safety is the important factor, but the officials should have seen the every down event was getting out of hand and they were losing control of the situation. I think the first down mark was just the final straw. He likely didn't make it, but the mark looked pretty much where the knee hit rather than where the ball might have been - human anatomy on that play says they probably weren't in the same place.
The appropriate response would be for the SEC to say they are taking a hard look at players hitting the dirt and on what constitutes forward motion in trick plays - the Statue of Liberty doesn't move - even the on field imitation. However, I fully expect the SEC to hide behind the fan's reaction as an excuse to ignore the obvious and just ratchet up discussion about poor officiating and no perceived solution. There could always be another "Tennessee rule" about unusual on field events though - remember the NC and LSU games.