You've never faced down your own mortality or been in a seriously dark place, have you? I have. I don't care how bad Hitler was, it's not a pleasant feeling to contemplate ending things. It's painful. It's a position that you are put in by pain. I have enough empathy to realize that.
But more importantly, I'm not super fixated on punishment in general. I think that Hitler was obviously a horribly bad person, and that by him ending things he could no longer cause harm. That is enough.

That people who believe in some god or other seem hyper fixated on retribution is not something in your favor. It does not paint you or your god in a good light. Good would be preventing bad things from happening in the first place.

Similarly, with regards to children, it is better not to have them if you can't even make a reasonably successful effort to provide them with a more hopeful and better world full of greater opportunity and wonder and joy. That is the merciful route.

Not having children in an evil world is merciful. Wishing children die before puberty is monstrous. You argue to create pain in innocents.

You religious people with your notions of duty and retribution, pain and punishment are not painting a world or paradigm created by any kind of good entity.

You come into an atheism community and act all high and mighty as if you have something to impart to US?

It's laughable. You have nothing but unfounded trash. You don't come here to convince us. Be honest with yourself for one goddamned second. You come here to try and firm up the non-existent foundations of your faltering faith.

You have no proof or value to offer. Just gaping, naked need.

And the third option: to change humanity to make it more just, never occurs to you

Man, religious people are a trip