I never respected Archer until Damage. Finally, he has the stones to stop assing around and do something that costs. His whole manning up arc in season 3 was pretty good. No longer playing at Captain, answering school kids' questions about toilets and getting into power struggles with his pet Vulcan.
THE GODDAMN EARTH WAS GOING TO EXPLODE.
You bet he threw his ethics and starfleet protocols aside. If he had not it would have been a very lonely high moral ground once 99.9% of all humans were dead.