You English people are nuts, when it comes to this subject. Do you really think these guys don't want to win? Do you really think they're not out there giving everything they have? Do you think they wanted the embarrassment of drawing with the historically weak American team?
Get a grip already. Can you boo your own team, sure, but what purpose does it serve, especially in a situation like this? Instead of acting like a bunch of asses, you should support your team, and encourage them to do better, not try to tear them down and embarrass them further. Say what you want, but these are still HUMAN BEINGS and no one likes to hear criticism, especially when they're already upset about something they care very much for.
Get a grip.