I am simply not interested in economic theories which create excuses for the exploitation of the working classes. I see such theories as propaganda and I won‘t listen. The words I use in my circles fit just fine for that purpose. And I suppose the word “externalities” fit equally nicely for capitalists who don‘t want to know about the effects their behavior has on the workers who generate their vast wealth and funds their excessive opulence.
As opposed to something like heliocentric solar system theory, where you don’t need to play word games to prove the counter. You just need to observe and collect data and use the same words to come to the correct conclusion.