I'm a bit "late to the party here"... , arguably an unfortunate choice of words, but I was struck my some comments previously made in this thread which seemed to suggest or argue that we and the media have been making disproportionate fuss over this incident because far more people are regularly killed or injured in other(particularly Muslim) countries in comparison to Manchester and other UK or other "Western" countries.

While this is true, I don't think we should be too hard on ourselves for wanting to mourn "our own". This is surely a natural reaction.
After all, we are generally far more affected by the loss of a loved one or friend than that of a stranger but that doesn't mean that we necessarily think of the stranger as a lesser person in any way.