I disagree a lot with the empirical claims here (as a former Classics student I have some news for you about how “strictly monogamous” ancient Greece and Rome were, for example), but I think that’s not even the crux for me—the crux is that we don’t have a moral responsibility to choose who to date or not date based on the vague effects on social norms. To put it in more EA-ish terms, even assuming your claims are right, the marginal effect on my society’s creativity, productivity… etc that is caused by me being poly, is surely extremely negligible, whereas the cost to me of not being poly is very big (particularly since I already have two partners). So the main reason I disagree with posts like this is that they just make unreasonable demands of people.
I disagree a lot with the empirical claims here (as a former Classics student I have some news for you about how “strictly monogamous” ancient Greece and Rome were, for example), but I think that’s not even the crux for me—the crux is that we don’t have a moral responsibility to choose who to date or not date based on the vague effects on social norms. To put it in more EA-ish terms, even assuming your claims are right, the marginal effect on my society’s creativity, productivity… etc that is caused by me being poly, is surely extremely negligible, whereas the cost to me of not being poly is very big (particularly since I already have two partners). So the main reason I disagree with posts like this is that they just make unreasonable demands of people.