Those are good in a historical context to show just how racist cartoons can be, but certainly not for entertainment. Same goes for the early Tintin comics, especially those set in colonial Africa have serious racist undertones. Something even the author acknowledged. And those undertones are completely (?) absent from the later ones. Just shows how subversive racism can be when it is part of everyday culture, and that even non racist people fall prey to using those racist stereotypes in their work. The same goes for sexism and any other kind of systematic discrimination.