Again, I'll say that you seem remarkably uninformed about North Korea for someone who is spending so much time ranting about it. I'd suggest that you do a search on FR using "Korea" and thread titles.
While you're searching, if you read the comments, look particularly for what AmericanInTokyo, John Valentine, sushiman, and TigerLikesRooster have to say, because they are in the area and know the people.
I think you'll find two things: one is that the risk of civilian casualties is several orders of magnitude higher with an attack on North Korea, and the other is that the North Korean regime is thought to be in its death throes - if we sit tight, there's a fair chance it will collapse of its own accord shortly.
There's also the China factor, but this is probably enough for you to look up at one time.