Look, I get that you mean that it's worth paying a high cost to stop all that suffering, but the cost not nothing.

The reason it's important to me to say so is that at some point, some actual people with actual (limited) resources, will have to devise a plan to make it all better, and then actually do the plan. That is a huge challenge that involves trade offs and hard decisions. And if you start with magical thinking, instead of extremely realistic reasoning, you're going to end up hurting a lot of people.

If cost wasn't an issue, rich countries could already take in millions of refugees from countries where life is very hard. Or they could pump trillions into the countries. They don't because cost is an issue. I am not sure if South Koreans are very happy about the prospect of paying for a reunification. A lot of West Germans would have been perfectly OK with East Germany staying its own democratic state.

Tell that to the South Koreans who don't want to reunify due to the amount of money it will cost the South Korean economy. https://intpolicydigest.org/2018/03/11/why-young-south-korea...

Tell that to literally every rich country.