> Some of the worst economic crises in history, including the great depression, were marked by significant deflation.

But literally "the worst economic crisis in history" happened on the watch of an inflationary central bank.

Moreover, during the greatest worldwide deflationary period ever the united states went from literally a war ravaged country that had just decimated (lost 10%) of its population to "world power" in 50 years, while also enjoying decreasing economic inequality and increasing quality of life across the board not to mention managing to manumit a huge chunk of its population.