Exactly. NE was up by only 6 points. The "conservative" play would punt the ball and give ATL excellent field position. Then after a couple breaks, ATL could be leading by 1 in the fourth quarter. Everyone would forget the stupid decision, and blame a loss on some desperate NE drive that failed at the end, letting ATL eat time off the clock.
Instead NE makes the first down, eats up time, and makes an even riskier first down on 4th and 3 at the ATL 37. They are not leaving this game to chance.