The Christian witness will encounter many people who trivialise their own sin by comparing themselves to others. I'm not Hitler, right? I'm not an ISIS terrorist, I'm not a rapist or a murderer, I've never even been to prison, so even if I die and it turns out there is a God, He's not going to send me to Hell because I'm a good person.
But as much as you may not be like Hitler, you are also not like Jesus. You are like you, though. And as much as you haven't done some bad things, you have done others.
Whenever Ray Comfort preaches, his strategy is to take his listeners to the 10 commandments and showing them that they've actually broken every single one of them by Biblical definition. He even shows that Jesus says if you even look at a woman with lust, that's adultery. If you've ever hated anyone, God calls that murder.
These are the two sins that James hones in on in the second chapter of his book. In verses 10 and 11, he says "For whoever shall keep the whole law, and yet stumble in one point, he is guilty of all. For He who said, “Do not commit adultery,” also said, “Do not murder.” Now if you do not commit adultery, but you do murder, you have become a transgressor of the law."
For all his flaws, Hitler also had his virtues. He was a great artist, he gave Germany the Volkswagen, he loved his two dogs, he was teetotal. But because of Hitler's evil deeds, we forget his good deeds, to the point where I now have "good things Hitler did" in my search history.
This isn't just how we judge Hitler, it's how we ought to judge everyone. In the past, I've used the example of Tamar Boggs, a young boy who saved a little girl by chasing her kidnapper on his bike until the kidnapper finally just gave up and released the girl. At his trial for armed robbery a few years later, Boggs' lawyer actually attempted to use the rescuing of the kidnapped girl as a defence. It was denied, and Boggs was sentenced.
In a trial, a judge cannot focus on the good things you have done, or on the bad things you haven't done. At the very least, he can look at this to give you a greater or lesser punishment. But because of the bad things you have done, the judge cannot just let you off scot free. But if a just human judge cannot let you off the hook, how much less can a Holy judge cease to hold you accountable?
I'll tell you. As much as a Holy judge must punish all sin, there is a loophole He can exploit in order to save His children. What God did is He sent Jesus to die on the cross on your behalf. He took the wrath of God on your behalf so that if you only have faith in Him, all of your sins can be separated from you. God doesn't have to judge you for a single one of them, because He has already judged Jesus for it. That's the only way to receive forgiveness.