Well said, twice, Elegran, the perpetrators certainly didn't care a jot about the political bent of the victims, or about their race, religion, gender, age etc. London especially is so multicultural it is possible that all seven victims could have been Muslims anyway.
What the terrorists do dislike in our country is our democracy and of course that is inextricably linked to politics. I can therefore sort of see how we cannot discuss one event without introducing comments about the other.
Maybe GN should have a separate heading for Breaking News where initial shock, sympathy, rejoicing etc. could be limited to dicussion of the actual announcement of the event. Like when the Queen dies, we don't really want to start attacking the monarchy and consequently each others' views in the first few pages.