South Korea has twice the population and 50 times the economy of the North. They have far more sophisticated and functioning weapons. They can afford to buy the best of the best.
Why are we in the middle of this civil war?
The North has a military as well. Better than all the ME countries if I’m remembering correctly, and would likely be backed by China/Russia in a war with the South.
We’re involved because of treaties, and other world powers are involved. See above.
“Why are we in the middle of this civil war?”
Because we aren’t just in the middle of a civil war, dunderhead. Soon they will be able to reach our mainland with a nuclear missile. As another Freeper pointed out above, if the N. Koreans were to hit a Japanese nuclear facility with its missiles, all that nuclear radiation would waft over to our continent via the trade winds. They are a THREAT to us, and many others in the world, and they tell us out front what they want to do. Sheesh.
Why?
1) Domino theory. Or have you forgotten how aggressively communism was spread during the cold war.
2) Nuclear Deterent. Or are you oblivious to Chia Head Jr’s constant threats and apparent progress.
3) Axis of Evil. It’s not just NK. They work with Iran and Syria. And probably some other bad guys.
4) China. Have you forgotten that China is still a communist country? Have they not espoused expansionist attitudes and actions towards Taiwan, Japan, Vietnam and India?