If we don't convert, they can tie with a TD, 2pt, FG. Kick the extra point, it requires two TDs. Would be interesting to see the actual statistics/odds.If they got two TDs but miss an XP we're still tied rather than a loss at a 12 point lead. Same with a TD and two fieldgoals. All about increased probability to win or go to OT.
if we don't convert we're no worse off holding the 11 point lead.