I agree, it is discomforting to think of those people never being punished for their crimes. There is definitely a part of me that wants justice for the people who commit horrible atrocities. I definitely don't like the idea that people can get away with things Scott free. It would be nice to think that justice is ultimately served, even if it had to be carried on in some afterlife. We don't have any good reason to believe an afterlife exists, so we should use this discomfort to motivate us to make sure justice is served here.
The idea of Hitler, Stalin, Mussolini, Mao, Lenin, and innumerable other evil dictators being morally blameless for their crimes gave me a sense of discomfort.
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But he does make a valid point, if there are no gods and no afterlife then there is no cosmic justice. But suppose instead that Christianity is true, I would argue that there is no cosmic justice there either. Think about those horrible people in history mentioned above, suppose they are burning in hell. Is this really justice? They have done very bad things, but is any finite crime worthy of being tortured forever? Worse yet, those guys are suffering the same fate as every non-believer that ever lived, no matter how good they were in life. They will be there along with every religious person who subscribes to the wrong religion (according to some Christians, this includes other Christians in the wrong sects). Does that sound like justice? Doesn't to me.
But it gets worse, the problem is, Hitler isn't being punished for murdering millions of innocent people, he's being punished for (supposedly) not accepting Jesus into his heart. So if he were to simply accept Jesus, even in his last breath, he would get eternal paradise. Meanwhile, I'm still going to be doing laps in the lake of fire. This is not justice.