The "if you don't like it, fucking leave" attitude is so stupid. That just destroys the whole concept of freedom of speech and democracy. We can criticize some ways where we think the government acts inappropriately and still be respectful towards the loss in 9/11, and the other losses America faces. Just because a tragedy occurred doesn't give certain people a free ticket to push through their agenda and say "anyone who doesn't like it can leave." Dissent is the best way to be a patriotic American, because that's why America was founded.