First of all, people, regardless of country, don't start wars, governments do. The North Korean people will not nuke anyone, ever. If that happens it will be done by their government. Be sure to understand that distinction as you go forward in life. The hundred million people killed during the world wars died because of decisions and actions taken by governments, not farmers in Germany, teachers in Japan, taxi drivers in New York or restaurant owners in London. War is one of the most regrettable failures of our collective approaches to government.
As for the rest, read the Allegory of the Cave. Someone who only knows shadows does not know reality. You seem to imply this is perfectly acceptable. I think most of the negative reaction you are seeing is because, of course, this idea is deeply flawed and, at some level, really cruel.
I'll take this to an uncomfortable extreme. Suppose the town next to yours has a culture of child abuse. That's just what they do. Every home has a dungeon and kids are kept in there until they become adults. No education is provided at all.
You and I look at this from the outside. You say it is OK no matter how horrible this might look to us. I say it is not.
I know you've had criticism for being young. I won't go there other than to say that there are a lot of indoctrinated young idealists in the HN audience. In some cultures they come out of school indoctrinated and fail to understand the world and their environment until perhaps decades later. I'd venture to say people don't really get it until somewhere around 30 to 40 years of age.
Start by reading some of the Greek philosophers. I am not suggesting you take their writings as facts as much as I would propose they might teach how to reason and view things from many angles. I don't intend this to imply you are ignorant. Not even close. It's something from my own education I continue to find value in over the years and I thought I'd share that with you.