The joke is that Cthulhu is usually unreasonable (at least by human standards), but is able to logically explain himself to the satisfaction of the human shown. This is unexpected.
I’ll leave you with this: cynicism is hip, but it’s exactly as irrational to start with optimism. You’ve got to start with what is, and what ought to be and work from there.
Existential comics is a humour series. I disagree, it’s a joke.
If that’s what you do, good for you. For every few dark jokes there’s someone posting “orphan crushing machine” style glurg. Optimism in the face of horrors or no hope is just unhealthy denial.
I was not trying to fix the world with that post, I agree. Sometimes I do write something that helps someone, though. IRL I do a bunch of volunteer work.