Christian theology regarding judgement goes like this:
God is perfect.
When we violate His standard imparted to us through the 10 commandments, our offence is infinite because it is against in infinite God
Therefore infinite suffering is a just punishment.
I have paraphrased the wise "truthwar" who has a blog at The Truth War.
He has made this post on Anne Frank because the topic of the merits of Anne Frank and Hitler, and their eternal suffering has been recently discussed in the comments section on Ray Comfort's weird little blog. The synchronicity of subject matter and shared theology is too strong. Read his blog and Comforts and you'll see the same phraseology. For example they share this odd concept of "false converts".
They, and their supporters believe that, since what we do in life, ie our "works" count for nothing in the eyes of perfect Yahweh, they are both, Anne frank and Hitler, probably suffering eternally in hell.
And they think this is a good thing. Well, it must be a good thing mustn't it? It's Yahweh's plan, and Yahweh's justice.
Credit where credit's due, to both truthwar & Comfort - they do allow comment on their blogs. A rare thing amongst their kind.