Because at one point in US history hunting black people was an accepted institutional practice. While their are scenarios where it occured with other groups, the implied threat is a return to slavery like conditions for “democrats.”
But if it makes you feel better, I’m sure racist white people will try to reintegrate those other groups as less than human too.
Who knew the quote:
“You either die a hero, or you live long enough to see yourself become the villain.”
Could work in reverse.