I love when Keynesians ask me to point to any recession that we got out of without interventionist government policy. This is a perfect example, but technically you could point to any recession/depression/panic before the Great Depression.
I would say that the Keynesians couldn’t point to any recession that has ever been ended as a result of government meddling either before or after the Great Depression and had that depression been handled as the one before it was then it would never have been so “great”, so deep, or so long.
Of course the K-bags will counter with the tired narrative that it was WWII that ended the great depression and that is proof enough that government involvement was the correct remedy. To this you can inform them that even if that were correct (which it is probably not) then the only example of their precious form of control economics ever solved a problem it required the conscription of nearly every man, woman and child into the war effort; that most industry become engaged in creating a product that was only in high demand because it was constantly being blown up; shortages and rationing; the destruction of Europe and Asia; the deaths of 50 to 70 million people and the detonation of two atomic bombs. Don’t get me wrong saving the world from the oppressive evil of the Axis powers was a good thing . . . but it is hardly an economic recovery plan.