Arms Control
I certainly don’t believe THAAD or any missile defense is a panacea, [b]ut if it inhibits North Korea, under some extreme circumstances, from using its capabilities, and instills some confidence in the government of South Korea to defend key assets and population areas in a more integrated fashion, then it’ll be money well spent.
[While the true extent of North Korea's threat toward South Korea is difficult to fathom,] to assume benign intentions would be imprudent.
Regardless of Chinese objections [to the deployment of THAAD], I don’t see South Korea turning back on this decision.