The term is used because the person being attacked was thought of as being of a different "race" by their racist attackers (and because that's the reason he was attacked; bot for being non-heterosexual, or for being a fan of the wrong football team). Not because one is in agreeance with the alleged "racial" distinctions (in the mind of the racist).
der Zug ist abgefahren
In English one would say "the horse has left the barn."
At least in my native English speaking world, we also say "that train has left the station". It's even listed as a cliche on a MetaFilter page on cliches and hackneyed sayings.
We also say "that ship has sailed".
But the cat's out of the bag now, so what can I do?
> Not because one is in agreeance with the alleged "racial" distinctions
> (in the mind of the racist)
That's the thing -- "race" doesn't really have a biological meaning. If anything it's just a vague suspicion that certain people are inferior or "alien" because of their DNA, the breeding, or simply their cultural upbringing. Of course it's all invented tripe, and biologically speaking it's equally untenable (from a biological point of view) to think of Poles, Anglo-Saxons and Italians as being of different "races" than it to think of Africans or East Asians in those terms.
But racists aren't the smartest bunch, you know, so in fact that's pretty much exactly what they think.
> "race" doesn't really have a biological meaning
And now the meaning of that word has shifted. That is all I said.