Yes, just like the obviously better equipped South Korean armed forces will eventually defeat North Korea. They’re backed by the most powerful military in the world, as you say.

But artillery still exists. And if the enemy has the high ground and the cities are in the plains, the death toll will be in the tens of thousands before victory is achieved.

This is the reason every citizen in Seoul knows where the nearest bomb shelter is. I can understand (but not condone) someone wanting to avoid that fate.