I don't share your opinion that the US red cards were indefensible from the referee's point of view (although I agree they were harsh), but I just want to say its very heartening to see such enthusiasm for the game and the team from Americans such as yourselves. Maybe there is hope for the sport in the US! Tonight's game should certainly help kindle interest.
One can disagree on a close call but IMHO no ref should give a direct red card on a play where the player gets to the ball on the play.
If there was no contact with the ball, no complaints. But if you get the ball and tackle from the side, no red card is defensible.
That's my opinion and I'm sticking to it.