As there's only one race, I guess everyone who chose anything but none gets the human race symbol (???) tattoed on their face. Still would be fun to see who chose to have other humans killed.
Now, if the OP in 4chan meant ethnicity, that's a different story.
The definition of “race” varies widely between different demographics and contexts. In a biological context which you seem to be insinuating, “race” is either nonsensical or an ancient synonym for species.
I legit question why people should be morally condemned for choosing to have others killed. It's too important a survival mechanism to just dismiss with morality like that, and claiming it's wrong violates the human right to freedom of thought. Humans are allowed to hate each other. They're allowed to want negative things, even to have others killed.
The premise itself is self-defeating because it uses the act of labeling people who make a choice to be targeted for violence and death to defeat the concept of doing so. Its use legitimizes the practice even to criticize it. Humans have to select other people to be targeted for violence because it's ultimately the only effective way to regulate behavior and enforce social norms, and refusing to do so destroys societies.
People need to stop judging others on their thoughts and feelings and start focusing on their actions.