Because a successful FG makes it a two score lead and effectively ices the game?And that includes their coach. They've got 4th and 1 and if they get the first down, they can pretty much bleed out the clock. Instead, Riley goes for the FG and it gets blocked. They've already had enough FG troubles in the game. Why not just sack up and trust the o-line to get that 1-2 yards and win the game?