Scoring points was going to slow Dallas' momentum a heckuva lot more than a turnover on downs. Dallas had scored 17 unanswered points and the Rams needed to halt that. Going for it on 4th down was an unnecessary risk and not the smart play. This play didn't call for aggression it called for wisdom and experience. Fans want the team to go for it on 4th down, good coaches know when to take the points.
It was a desperation move in a game that was rapidly slipping away from the Rams. And it cost them. Do you really feel this team can afford to give away ANY points?
Yes.
The reward outweighed the risk. From 2009 to 2013(5 year period), there were 675 rushing plays on 4th and 1 or less. 66.1% of those rushing plays resulted in a first down. Over that same period of time, kickers converted 90.1% of FGs(1418 attempts) between the 10 and 20 yard line.
That means there was a 2/3 chance that the Rams would convert that first down if we're looking at the league average. The Rams were also on the Cowboys 15 and were running the ball with ease...both of which are factors that further mitigated the risk. The Rams defense was struggling to stop Dallas and Dallas had scored 17 unanswered points. You are looking at a 24.0% difference between hitting a FG in that situation and running for a first down.
In that situation, the risk outweighs the reward. Had the Rams defense been shutting Dallas down, I would have said, "Kick the FG". But with the defense playing the way they were, there was no reason to expect that they would stop Dallas from scoring. The Rams needed to keep Dallas on their heels. They needed to push for that two score lead.
The aggression there was warranted.
Here's something even more interesting...as sucky as the Rams have been from 2009 to 2013, we have converted 78.9% of our 4th and 1 or less yards rushing attempts for first downs. We have converted 90.0% of FGs between the 10 and 20 yard line over that time. That's an 11.1% difference for our team.
As I said before, the reward outweighed the risk.