The Seahawks would have done better to try to run down the clock before scoring that last TD. ATL would have eventually called time out, but they were in freak mode at the time, and probably wouldn't have realized to do that for another 30 seconds or so. Not sure that would have been enough to win though, with the way they gave up all those yards.
I remember a game last year where the defense would try to let the other team score, and the RB was almost tackled by his own team trying to get in the end zone.