hell Mises and Rothbard talked about state economic intervention to avoid the deflationary problems I'm talking about

Horseshit. No, Ludwig von Mises never advocated for government intervention to fight deflation. In fact, he strongly opposed such measures. Mises viewed deflation, particularly in the context of a sound monetary system, as a natural and healthy market process. He argued that attempts by governments or central banks to counter deflation through inflationary policies or intervention distort market signals, lead to malinvestment, and prolong economic adjustment.

I'm wrong here about "state" part. Neither of those guys advocated for state intervention although Rothbard had some writings about structuring markets to avoid extremely deflationary conditions