As I have said before, if you have a plate like this expect a “slave heritage” plate next for people who are descendants of slaves. The same arguments for creating it apply in both cases.
Personally I don’t think the government should be issuing any of these kinds of plates, whether or not I am in agreement with the sentiment of said plates. If someone wants to send the message on the plate they can buy a bumper sticker.
The nanny state has to look out for people who are too intellectually dull to think of a good vanity plate.