Eh, to be fair, the Eternum Lovers are not much better. Not really a thread I will visit anymore, simply because people who participate there are taking everything way too serious.
I once made a joke that I would not mind a NTR-scene for people who do really dumb decisions (like making Penny cry, because many of the Diehard Harem Fans expected a lewd scene with this one girl in University who hates Penny (Regina)... Come on, expecting a reward for losing the path to a Main LI? Who is also way more likeable AND hotter than Regina?). People did not really appreciate it, even if it was clearly a Joke (and I stand by that, if you make such obvious decisions wrong, you can get punished).
And dont forget that Chang is only allowed to have an ugly girlfriend, because diehard Harem fans would get insufferable if a significant character other than MC would get a attractive girlfriend.
So while your point has some truth, the other side of the spectrum is not really better. Would be great if both sides would be more open-minded, accept that there are different fetishes and that not every fetish does fit in every game (since there are people who want actual NTR in games like Eternum and others want a Harem route in NTR-games...)... Or ideally just play more than one genre of games and not take everything so seriously.