For what its worth, his email seems to be much less confrontational and manipulative than many others we've seen posted here. And the information he is presenting is at least somewhat relevant and from a mainstream media source. Usually its more like, "OMG a two-headed baby was born in Albania! The end is so close!!!!"*
You are probably correct though not to make a debate out of it, like you said, enjoy the relationship you have with him, even if its not perfect.
No Apologies
*no offense to any two-headed Albanians on the board