Just because he behaved within the bounds of his culture doesn't absolve him. That's a very dangerous trap to fall in. As for Sadeas, that man was universally recognized as a bad person, so not the best benchmark.
Sadeas maybe, he was just kinda a prick. A political, backstabbing one, but still just a prick.
Amaram, on the other hand, betrayed mankind to actually Rage incarnate. He deserves nothing but worms.
Moash and a Cremling both crawled across a rocky field when they saw a merchant.
The merchant said "Stormfather, a disgusting bottom feeder! Gah, and a Cremling too!"