I don't understand how anyone, regardless of nationality, race or political affiliation, can read about such attacks, and in this case going back only a little over 20 years, and not realize that Islamic extremists have been repsonsible for so very, VERY many, if not most, terrorist attacks across the globe.....so many innocent lives taken and so many horrible injuries to innocent people.........and after understanding this, not wishing that something could have been done sooner to prevent at least some of it....I just do not understand it and likely never will.