They might make this world the best place it has ever been, solve all the problems caused by all the generations that have come before them, and make society a rich garden of opportunity for all.

This is why war is necessary and so does the bad days in the life of any person. Less you are exposed to the bad days more you are likely to get damaged once the pandemic like event triggers you. Also taking over the current generation is lot easier than the previous generations in army context.