Post WW2 War Trial

For the first time in the world's man history, there's a lot of tribunal for war criminal.
Before these, every single person have involved the war (soldier) couldn't being trial with the name of suspicion : "Crimes against Humanity". Every single person who as involved (soldier), being shield with war code of conduct itself, not a civilian code of conduct ones.
There's a lot of man have find guilty and condemned to execution untill death, being prisoned for a life or many years.

Thanks to that, every single person in the world must think thousand times starting an agressive war, committing mass genocide and raping and humiliating another ones.
Thanks to that too, every nation in the world was commited to build The United Nation.