While I won't call the Arab Slave trade benevolent, it differed greatly from the European counterpart. Plus slavery was a part of African culture for the longest but it was generally a means of assimilating conquered people into the conquering society instead of making a person property, not human unfit to be with general society, etc. So I dunno if calling the first Muslim converts c00ns(for extreme lack of a better term) makes much sense cuz that would mean all Africans regardless of religion were c00ns too.
To answer the other question, Ethiopia practiced slavery until 1924 so certain effects linger today, not to mention misinformation from news depictions from cac media, crime dramas/movies, and relatives who come to America and have bad experiences with other black people.
As for us and other Africans, it goes both ways so its no point in discussing it. We should be on some Nkrumah shyt, leave it to people like me to eliminate white washed Ethiopians.