Did you know how vile the Amharas were back then? I do not blame my forefathers.
Additionally in those times it actually was a crime for a merchant to sell firearms to the Muslims of East Africa under the pretext of anti-slave trade laws, obviously the horrendously opressive slave-napping Amharic regime did not face this treatment and actually were better armed then some European states (when Italy attacked they had more firearms, better firearms, and better artillery).
Simply resistance was incredibly hard in those days as a few old ass Turkish muskets really can do nothing to stop a army of 100,000 Xabashis with rifles, long-guns, and maxims.