Mankind sucks bigtime. Nobody deserves to get to heaven. We're all disgusting, twisted, evil people who have no place in a happy afterlife. There aren't very many Hitlers, but there are so, so many people who have the opportunity to help someone in need and just keep walking. Our race is doomed to eventually destroy itself due to its sinful nature.
Thing is, God knows that, and he still loves us. He sent his immortal son down to this hellhole to die in our stead, paying for our sin. Believe that, and you can get to heaven.