> Then I would invite you to speculate on why we have not been attacked here in the last 4-1/2 years.

We've been attacked here in the UK. As far as I can tell, the attack came as a surprise, partly because it did not originate from a global terrorist network but from a small group of self-starters. (I know you were talking about the USA rather than the UK, but I don't think they are that different in this.)