I thought it was the wrong call, but in the end, that is an extremely tough decision to make and you can hardly fault a coach for taking the points.
Still, if you trust your defence enough to give Brees the ball back after the FG.... why don't you trust them enough to get the ball back for you if the Saints are pinned at their own 1 yard line? (assuming we we fail to score the TD). I will say that if we fail to convert there, that place will be absolutely jumping (not that it wasn't already nuts).... and there was so little time left that we might well not have ever gotten the momentum back.
In the end we won, so it doesn't matter if it was the right call or not, and hindsight is always 20/20.