Calling for the complete destruction of your enemy after suffering a surprise military attack is pretty common, I would have expected no other possible reaction, from any administration anywhere in the world. Except maybe the Dalai Llama or something.
The key is it doesn’t last. It’s biological in nature, and that neurological damage suffered as a result of the intense trauma slowly heals on its own. Rationality re-asserts itself, and you start looking for actually pragmatic solutions again, instead of emotional reactions.
As we can all see with our better objectivity from so far away, their current course of action is not an actually practical, pragmatic solution. Instead it is likely to make things worse. They will, one-by-one, slowly heal enough until this realization begins to become apparent.
Where they are currently unable to see it. In many cases, anyway.
edit: We have a term for the feeling, incidentally. It’s called cold fury. I think we’ve probably all seen it for ourselves, or maybe even felt it before. Don’t fall for the “I’m perfectly calm” line though. It’s a lie, and they’re just lying to themselves first.