Hitler Without Cruelty

"The decision taken, the Fuehrer made it known to those entrusted with the Final Solution that the killings should be done as humanely as possible. This was in line with his conviction that he was observing God's injunction to cleanse the world of vermin. Still a member in good standing of the Church of Rome despite detestation of its hierarchy ("I am now as before a Catholic and will always remain so"), he carried within him its teaching that the Jew was the killer of God. The extermination, therefore, could be done without a twinge of conscience since he was merely acting as the avenging hand of God - so long as it was done impersonally, without cruelty."
from Adolph Hitler, by John Toland, Doubleday Books 1976 pg 703.