Seoul responds to North Korea's nuclear test with drills to 'wipe out' Kim
Though US president leaves radical comments as usual, it's difficult for South Korea to imitate that attitude. It's because US is so far from North Korea that they don't have to be careful of military actions by North Korea. Even if threat of intercontinental ballistic missiles is approaching the US territory, it's still difficult to target US mainland.
On the other hand, South Korea is neighboring to North Korea and is always exposed to threat of North Korea.
So, we should take it for granted that the tactics of South Korea is more sophisticated than US's.