Hitler may have repented - I personally am a big believer of "deathbed" conversions, the end of life is designed to be humbling. As far as judging we are to make judgments with a righteous perspective.

Joh 7:23-24  If on the Sabbath a man receives circumcision, so that the law of Moses may not be broken, are you angry with me because on the Sabbath I made a man's whole body well?  (24)  Do not judge by appearances, but judge with right judgment.”