Anyone can make a bad call, it happens. But instant replay is there so you can look at all the evidence you might have missed to fix the call if necessary. On that final play, the refs must have seen something no one else saw, because I dont think anyone else in the world thinks Seattle came down with that ball.
Feel bad for the refs though. They are doing the best they can, but they just arent experienced enough to officiate these games. Best part was how at the final play, there were two officials standing side-by-side, one signalling TD, the other saying no catch. The whole debacle captured in an instant... They might as well hire me to do it, I would do just a bad a job for free