It also has to be said that acts of terrorism do not frighten or intimidate democratic society's to any great degree.
They do, however, [censored] the aforementioned society's off.
Now that is something to be frightened of.
I read your post and smiled, then noticed your location and doubled it.
Free people are drawn together by attacks on their country. Burning London as a way to break the spirit of the British was a bad plan, as was attacking Pearl Harbor and the attacks of 9/11. For good or bad, we're brought together and inspired to great violence when annoyed. We also carry on.
Our biggest dangers are the same as they were 200 years ago - not from other nations, but by those who would trade a bit of liberty for a bit of security, to paraphrase somebody a lot smarter than I.