On which Level is that wrong?
I mean, the Alliance takes Saurfang as Prisoner, heals him and the King himself orders that he should be treated with respect.
What does the Horde do? Take young Girls and turn them into Mind Slaves, use them as Test Subject or let them fight under the threat that their children will be murdered. If they even take Prisoners, most of the time they nuke their targets instead of conquering them fair and square like the Alliance does.