War is a necessity. Eternal peace kills much more effectively than the bloodiest war. To maintain the possibility of life on the planet in a state of eternal peace, it is necessary to renounce procreation, pleasures, and everything else. Is that life? Wouldn't it be better to die with honor in battle, knowing that this will give your children the opportunity to live at least a little better?

You have a strange logic. Why is war needed if no one will fight with anyone? There will be no diseases, no weeping. And there is no need to give up anything (except drugs, smoking, and excessive alcohol consumption;)), everyone will have everything: food and entertainment. And even the need for the undead will disappear. Souls will either find peace in the realm of eternal joy, or they will eternally suffer in unquenchable fire, in the land of eternal sorrow.
In general, you are reasoning like a well-fed person. The most terrible and meaningless of human creations is war. Have you ever been in a battle? ...Then don't rush to say that war is cool. Have you seen the movie "9th Company"? It doesn't even convey a tenth of the essence of war. Imagine a situation: an army of 15,000 people. Each has their own life, their own story. 15,000 stories. None of them wants to die, because each of them has a family. But all these people will inevitably die! Do you still think that war is necessary and cannot be avoided? I don't know if I managed to convince you of anything, but in any case, I tried.