I engage with maybe half of what Napa posts, not to try to change his mind because of course that won't happen, but to address falsehoods or misleading comments. I find it difficult to let BS stand unchallenged.
Also because I enjoy the give and take of political discussions, especially with those who see things differently than me. I do the same with some posts on Facebook from the Manning Centre and some of Warren Kinsella's posts. Better than living in an echo chamber where all I see are points of view that align with my own.
That makes sense if the repartee was with someone who had something useful, intelligent and/or thoughtful to say. Engaging in serious, factual debate is great, but that's not what happens with NC. Better to live in an echo chamber than to wallow in a pig sty.
As for not letting BS go unchallenged, I again say you're tilting at windmills. No matter what you say, the BS is still going unchallenged because he's not listening to anything you have to say.
And I say all of this with respect, bman. I know you and know your character.