I mean you go to war against someone, or publicly state your intention to do so, why is everyone so shocked?
Bombs could start going off all over London, and tbh, i wouldn't give a damn. We live in this amazing world where we think we can bomb whoever the hell we like and it is all wonderful and happy and yay and ought to expect absolutely zero retaliation, but one person get's killed in our own country, and we react as if they have just committed the most inexcusable of crimes.
"terrorists" (they are terrorists, we are terrorists, the word means absolutely nothing) can kill whoever they like within our borders, to act schocked, upset, alarmed, that's just being childish. Given what the western world has done, we should accept that far worse should and can happen to us. suddenly war is this thing that only happens elsewhere, and the notion of something happening within our own borders is just an unthinkable notion, and should it happen, is somehow a monstrocity. As societies, we have become utterly pathetic.