Yes, you are claiming to speak for others, to know what is in their minds and their hearts.
I will not comment on C S Lewis, it is a while since I have read his books. Except to say that, in the extract that you cited, I believe that he was imagining how the Devil might tempt man. 
But there is no indication that the people to whom you spoken here, have ever been tempted thus, let alone that they have fallen victim to such temptation.
Not sure why you would wish to take a snide remark, and then to 'convert it into a broader question for examination'? Why not simply hold back from the remark in the first place? 
My interest in Mgr Fazio is in his understanding of Pope Francis. I doubt he will quote Francis out of context, as you did  with your opening salvo in this thread, when you wrote:- "All nations have a right to control their borders". This omitted most everything that Francis really thinks about refugees.
But Yes, I will look out for references to the Cross. Thank you.