The "European Phenotype and Names Only (White Humans)" mod for Stellaris was pulled from the Steam Workshop by Paradox Interactive. The mod aimed to make the human characters in the game more "European," which is to say to make them all "white."

A Paradox spokesperson issued this statement to Eurogamer about the matter.
"We shipped the game originally with an accurate representation of humans, that is to say diverse in both ethnicity and personality. We embrace the idea that players mod the game to best represent how they want to play, we do NOT however wish to enable discriminatory practices.

"We appreciate any inappropriate mods being brought to our attention and will take them down where necessary, we also encourage players to make use of the flagging function provided by Valve where needed."

Community Manager, Paradoxal Bear, wrote a better explanation via Reddit.
"We saw the mod, thought it wasn't in very good taste, but let it remain. Then the creator of the mod decided to update the description of the mod to promote an "agenda" not related to computer games at all, and this was being clearly displayed on our product page. We decided it was a step too far and removed it."

Paradox COO, Susana Meza Graham made an additional statement via Twitter.
"We have a few rules of conduct that have been in effect for the better part of a decade where racial slurs, among other things, are not allowed," said Graham. "We interpreted this particular mod as breaking those rules of conduct, however it would appear that the comments surrounding the mod, rather than the mod itself, were the biggest problem.

"We welcome everyone to create all kind of mods for us as long as they comply with our rules of conduct and we expect our modders to help us keep the comment sections free of any racial slurs or other things that do not comply with these same codes."

Of course, the mod is still available from third-party sites like ModDB. People are already saying that the removal from the Steam Workshop is "censoring" their "free speech." Those people continue to be morons.

Paradox is also taking a look at the "Separate Human Phenotypes" mod that is still currently on the Steam Workshop.