Games we lost due to bad luck - and this game qualifies in spades - are not the worst for me. The missed field goals two years ago or the reff job last year bother me far worse, but all four recent losses to Utah are based in massive bad luck.
The worst for me are Washington in 96, Indiana in 79, New Mexico in 80, Baylor in 83, Arizona in 06 (another PAC job), etc. See a trend? They are games that were important to BYU's national image.
I don't think there has been one Utah loss that had much to do with our national prestige so why would I care. Despite 4 losing years to them we still out recruited them this year.