This may be true but don't give up on the American people. We are a very resilient people just naive sometimes.
I have not given up, as you point out we tend to be very resilient. However, we do seem, these days at least, to not want to deal with the obvious.
Is this international terrorism? It's hard to say one way or they other, but we should at the very least be willing to consider that as a possibility. However, it seems that LE and the media are going out of their way to explain this in any other terms other than terrorism. I even heard one "profiler" explain this as a couple of teenage kids. If this is teenage kids doing this we should be seriously concerned about the quality of our Homeland Defense and Law Enforcement.