An extreme version of this is: What should the German health service do if someone says they are willing to donate a kidney as long as it doesn’t go to a Jew?
On the one hand, nobody is forced to donate a kidney and by forbidding this we’re making things worse for an innocent patient. On the other hand, it can be seen as the state sanctioning this kind of discrimination.
I find it hard to believe you would genuinely be that composed and detached, if someone ran over your 3yo child and then used their head as a hood ornament for the lols.
However, I guess I have to take you at your word.