If the results so far are any indication, those people share Trump’s view that pretty much everything the Beltway crowd has done since 9/11 has been an expensive disaster.

We started out fighting a small group called Al Qaeda holed up in caves in the mountains of Afghanistan. After 15 years of war, we now find ourselves facing an Islamic State that occupies two countries and is exporting terror to Europe.

It didn’t have to be that way. There were always two ways of looking at the threat post-9/11. One was expansionist and the other was what the Post writers like to call “isolationist.”

I never thought that term made sense. Look at Switzerland. Somehow the Swiss have stayed out of other people’s wars for centuries while maintaining good trade relations.

Their neighbors in France face a terrorist threat and the Belgians suffered that deadly attack last week. But nobody’s bombing the Swiss.