I can only think of one contrary example within the last decade -- Libya, where Gaddafi was still in power when we started bombing. It was complicated, and I think in the end it was a poor decision, but I don't think it's fair to consider it wrong or evil.

Looking farther back you find Iraq and Afghanistan on the list with similar disclaimers. In any case, neither was a "lob a few missiles from the stratosphere and peace out" strikes the parent comment implies.

Let me know if I'm forgetting something.