There is a big difference between celebrating with your team a beating your chest like Deon...ESPECIALLY when you are part of one of the worst offenses in college football.
Robinson is a year out of high school, getting his first carries in Memorial Stadium. I'm going to cut him some slack if he gets excited, even if it is after only a 5 yard gain. He didn't know he was going to fumble on the next play and I'm sure he wasn't trying to.
Different players play best at different intensity levels. Helu seems like a calm dude, so it fits that he doesn't celebrate too much. Seems to work for him. Other guys need to get the adrenaline flowing and feed off of it.
The bottom line is that we are all pissed that they lost and the offense looked so bad. If they had pulled out a 10 - 9 win, no one would be complaining about a true freshman getting pumped after his first college carry.