So, the Military Leadership of Orlais sends Chevalier recruits to alienages with the sole objective of killing as many elves as they possibly can?
Do you have a source which supports your claim that the Imperial Officers specifically order them to indiscriminately murder every elf they come across?
No such source exits, so no, they don't.
Ser Michel describes it as a final, terrible, hazing ritual before they take their vows. They're taken for a night on the town, gotten dead drunk, and told to go into the Alienage and put a criminal to death.
They are not told to kill every elf they come across, nor to burn the place down, nor to reenact a Purge, or any other such foolishness.
They are, however, the scions of noble families, with all that entails, and the instructors don't ask for proof of criminal activity come morning.
I don't condone it, but I believe that the tactic of using hyperbole to blow it out of proportion actually cheapens the horror we are supposed to feel. As though the detractors feel like state sponsored drunken murders somehow aren't bad enough.