The guy who did this is a piece of shit. A retaliatory attack means you attack the people who just attacked you. This guy killed innocent people.
This is the problem with Britain and the United States pussyfooting around and not rewarding good behavior and punishing bad behavior, and being too scared to address the issues we face with radical islamic beliefs. Eventually, someone thinks they have to take matters into their own hands, and that person is usually someone too stupid to realize they are not attacking the people who did the crime but regular Muslims instead (most likely). This is a lowering of the standard and it reminds me of socialism and the ills of it. When you do not reward good behavior and punish bad behavior, eventually the lowest standard is the standard that becomes implemented. It is bad in socialism and it is bad in dealing with radical islamic terror.
F this guy, just like any other terrorist piece of shit.