EDIT 2: If those are just icons...why was it then important or "right" to forbid that "only white peoples" mod in the steam workshop?
Yeeeeaaaaaahhhhhh..... that's a bit of an abrupt change of subject but since that happened awhile ago, and you're still confused about it I guess I'll take a swing at an explanation.
First off, I am personally of the opinion that there should be no arbiters of good taste for video games. Nor do I think we should be stopping anybody from being vocally racist. This is largely selfish, as I like to know who to avoid. But since this has happened awhile ago, I've seen this discussion before, and I have empathy, I do have an understanding of how the people who disagree with me feel, so let me take a swing at explaining this to you.
Comedy is tragedy plus distance and, for better or worse, Stellaris is targeted to western nations where the last attempted Genocide was over 50 years ago. If this game were being made in 1950's Poland, it probably wouldn't have a genocide option OR decent graphics. If this game were made in modern day Rwawanda, it also probably wouldn't have genocide or decent graphics. But this game is being made in Sweden and being marketed towards nations ready to consider genocide abstractly within the safe space provided by a computer game. The same things don't apply to racism. There is no distance from racism, it's still a very real force in western society today. Not just in America, but in many western nations. Germany, France, the United Kingdom, you don't need to look far to find racism as a hot button issue. So I don't blame Paradox for taking a pass at this issue by removing a controversial mod.
Then there's the community aspect. Paradox is trying to create a product that appeals to a wide demographic market. One of the draws of that is community building. Racists are generally not very pleasant people, and in terms of community building, they're not great for it unless it's a community of other racists.
But you know what, I'd say those are acceptable drawbacks if the 'all white mod' brought anything to the game. But it doesn't, limiting human phenotypes to only white people is not an interesting game mechanic. I'd go to the mat for xenophobia, though it's basically racism on steroids, because playing a xenophobic race makes the game different enough from playing any other type of race to be enjoyable. I'd go to the mat for genocide, despite it being the most horrible thing I can imagine, because it's an interesting game mechanic. The entire idea of who can and can not commit genocide, the benefits of that and the way it may outweigh the benefits of taking a course that restricted genocide, these are all interesting strategic choices, which is why population purging has been expanded on in this expansion. Only having white people is not an interesting strategic choice, allowing its inclusion does not justify the negatives it brings.
I hope that explains why your original post and your follow up are two entirely separate issues.