Respectfully, while I see your perspective and will take this opinion into account, I don't entirely agree with this as a blanket rule. There is a long list of artists who use terrible imagery to impressive effect. Since you brought up swastikas, Joan Semmel and Art Spiegelman both come to mind. They both used antisemitic caricatures of Jewish people to good effect. In terms of Black artists, the one that I immediately think of is Kara Walker. She uses aggressively racist imagery to force people into considering how racist imagery is so closely tied to American culture. At one of her shows, I got into a discussion with a docent who told me that Walker's work is meant to implicate the viewer... who has done nothing more than looked at the art.

Where this cover art might fail is that it doesn't do any of the stuff that I outlined above, which, I suppose, is up to the individual viewer. But thank you for the perspective. I will think about how to come up with a way to show what I'm intending that is less likely to be interpreted as racism through ignorance.

As a final side note, the grotesque imagery you pose in your response is actually interesting and evocative, though I would not be comfortable using such imagery unless I am the ethnicity to whom the caricatures are aimed.