It's not a matter of blame or making excuses, but of understanding why we behave the way we do. For many people that does help the process along. Sometimes "food tastes good" really does wind up being all there is to it, sometimes it's a lot more complex.
I do understand what contributed to the bad habits I developed and I think recognizing them has helped me find other ways to deal with those issues when they come up. The caveat is that it's easy to get "stuck" in the analysis without active follow through, and that's not helpful at all.
I guess what I'm saying is that it can help, but it's only part of the battle. You can be just as successful by actions alone, and work your way through whatever issues come up along the way.
FWIW, those Biggest Loser breakthrough's...I wouldn't put too much stock in those. There's a LOT of editing going on there! It's hard to believe everyone goes from one session of crying it out to immediately being motivated to hop on the treadmill