In hindsight, very hard to argue with him.
You don't have to waste your capital destroying these people. They'll destroy themselves.
And they obviously don't. They're comically weak. We have no national interest there. So why are we there?
Yet on a deeper level, it's that leftist ideology doesn't let us determine between friend-enemy, as Schmitt understood. We are universalists: so we can't understand that some people need to stay enemies. Perversely, this means we must invade them!
They are different. Military conquest can't change them. Afghanistan. Iraq. Eh?
Believe what we do, whether or not it suits you, or die.
When you believe humans are all the same, you therefore believe your ideals (i.e. liberal democracy) are the ideals of all human society.
Therefore, if any society rejects this, it is inhuman: and must be invaded
Therefore, why America must invade you.