The Texans were stacking the box with 8 men. That is the reason Payton kept throwing the dang ball. And if we would have played football up until that point it would have been a perfectly normal and reasonably sound decision on his part. Big deal they had a substantial lead. This entire argument about classy or not is just plain NOT CLASSY. Manning and his team were payed to play their best game, they did. From start to finish. The real question here is why didn't the Texans? Not whether or not another TD mattered one way or the other.
8 men in the box, against the run, of course ANY QB in the league is going to be throwing the ball. Or eating it for a sack lunch.