First of all, "Do you think Americans have responded positively to 911" Is not a clear, simple question. If you had read some of our previous discussions about this and other issues, you would realize that you need to be specific, you are dealing with several different cultures, races, and nationalities on this board, and a question like this can be interpreted several different ways. As for the people that know you know you don't have trouble expressing yourself, that's great, but consider those of us who Don't know you as well.
However, now that you have explained yourself...
Will justice prevail? Maybe, but probably not. There are too many small, independent groups that could launch a similar attack against the US or any country for that matter. So, imo, justice will not prevail until we can get the mindset that killing thousands of people is somehow appropriate retaliation. Yep, I said retaliation. Are you aware of their reasons? I'm definitly not saying that what they did was right, but their reasons for doing it were quite honorable, actually.
Have we taken appropriate steps to prevent it from happening again? Well, I think we have taken the steps that the American people are willing to take. We could go farther, but going farther would also violate the civil rights we have built our country on, so I don't see that happening.