EU, HOI and the like have always been one thing above all else: They are a series of games. Entertainment products, where the player re-enacts history for amusement purposes. It is not a documentary, it is not an educational tool. The thing about this 'show it how it is' argument is that you are normalizing it as a thing to include in entertainment. I mean, the way colonization, Africans, American natives and other 'uncivilized' peoples are treated in EU and Vicky is uncomfortable enough as it is. We don't need to make slave ships parts of our entertainment. There is no reason to have it. There is no historical mandate, this is not a historical text, this is a game we play to have fun. I certainly wouldn't buy a game that asked me to manage a slave trade as a core gameplay mechanic. Is that honestly a thing you think would be enjoyable? Sending out fleets of slave ships, and building your own little triangle for fun and profit? And I really should hope I don't even need to ask about organizing genocides [not that the 'Attack Natives' and 'Harsh Treatment' features don't seem to have that covered in a more abstract way]. I mean, maybe that is a thing I'm just completely out of touch with the core demographic on - but unless it is a thing you think would actually be enjoyed and fun to put in a product whose end purpose is to be a fun experience, why on earth should they include it in the game?
PS: The posters up-thread talking about the racism they've encountered in MP? They aren't alone - it's not a paradox thing, it's more common than you'd think in this entire subset of gamer culture. I mean, boot a random server of, for example, Red Orchestra 2 / Rising Storm. See how long it takes for the voice chat to erupt in the first flurry of Nazi slogans (Heil-ing, etc) or horrifically racist, 'ching-chong' level 'imitations' of the Japanese dialog. In my experience, that isn't more than two or three rounds. Bonus points: Attempt to get a single person on said server to agree that there's anything wrong with that. I'm 0 for 3.