Um, they are still only down 1 score. You're not understanding. You want score certainty. If you're going to need the 2 point to tie, you go for it now, then you know what you're playing against if you miss it. If you go for 1 then you're operating under the assumption that it's a 1 possession game, then when you miss the 2, it's too late to make up those missed points. If you go for 2 with 6 minutes left and miss you know that you need to score twice in 6 minutes to tie/win.