Glock, I love ya GB, but this is an odd hill to die on.
It's freakin' football. It's a physical game. This isn't even high school kids where I suppose I could better understand the "no handsy allowed" approach. But 250lb college men sometimes need to be corralled, as was discussed above... as in EVERY sideline I know of does this. Guys want to get too close to the field, coaches yell at them... eventually coach walks in front almost if not physically corralling them, sometimes a coach will grab a guy by the shirt before he gets so close to the sideline as to have a penalty called.
Not sure the umbrage here in terms of the nature of a sideline with 50-100 football players on it, engaged in the game and amped up.
As to how this plays into the original scheme, if THIS sets off a player, they should be no where near a football field. As noted, there must be more to it, but there is simply NO excuse for popping a guy like that. None. Get what's coming to you at that point.