One thing, mulling over these attacks, apart from the obvious (9/11, Boston Bombings, etc.,) what is interesting is the USA, despite their appalling record of mass shootings by lunatics and accidental gun deaths, with 6,469 already killed this year, they do not appear to have anywhere near as many "home grown" acts of terrorism. Wonder why this is? Is it because all police are armed? Is it because citizens have a right to self defence and can carry firearms? Are they doing something right that we are missing? If so, what?