Who cares if they're democrats or republicans. What do you want them to learn? They didn't make the argument you object to, a writer did. A conservative writer, actually.
So you figure the writer went out an researched the families involved and this argument was not fed to him? I am less sure about that.
What I want them to learn is that if they are Dims they are involved with a bunch of people who hate them and their children and who would sacrifice their child in a heartbeat. They should learn not to be Dims. That should learn that the party of slavery, the party of Jim Crow, the party of segregation, is still very race oriented, it is just who they favor has changed.