I don't see why European artists should self-censor so as not to hurt the sensibilities of Americans just because your country was built on slavery and genocide. Sort out your wounds yourselves and let us live.

(For the record, there are plenty of "black" characters (Numids, Nubians etc.) in Asterix and Baba is the only one with his characteristic. Many of the others are depicted favorably, as the other commenter said)