Neville Chamberlain et al. wearily disallayed suspicion about Hitler, even after enjoying the best seller ‘Mein Kampf’, and thought nothing about purge happy Stalin, when he declared to his daughter Svetlana, that, “It is very painful to kill one person, but a sinch to kill millions”
The measure of sanity is for some, not a judgment that can be quantified, since merely personal behest qualifies.