Because it's a polarizing topic. I find this particular ad-hominem rather mild, compared to what you find on Reddit.
I am not defensive, I am embarrassed for you and all of the people poisoned by this antisocial propaganda, and it makes me despair for humanity.
For instance, I really like your view of finance as these emergent properties of human behaviour. My question is then: how do you propose we refer to the entities we currently have in place for trading of securities, market making, fractional banking, clearing houses, central bank issued fiat, etc? Clearly there is a difference between those "things" and what we do in DeFi, right?
So what label am I allowed to use to distinguish these entities from DeFi?