Why didn't Harry Truman blame Herbert Hoover for the Great Depression?

Harry said, "The Depression wasn't caused by Hoover but made for him"

That is true because the Depession started in Germany after WW1 when the country was devastate economically by the war. The British blockade of German ports during the war prevented food from getting into the country. The German government sent farm workers to the front to fight the war while neglecting to organize women to produce food. At the end, the people including the troops were starving.

When the war ended, Germany got no help from anyone. The French and British imposed penalties that further weakened the country. The depression started there with people scraping the bottom of sewer covers with a spoon to eat the scum for nutrition.

That cascaded around the world and eventually reached the markets in this country.

However, Hoover did too little, too late to stop the bleeding. The single shining example of his attempt to create jobs is the Hoover Dam. He could have done more. FDR did.

Massive government spending by the FDR administration along with regulations stopped the bleeding. Money started circulating and jobs became available. Laws restricting banks from risky adventures were passed. With the preparation for WW2 our depression ended.

It is government spending that stops economic depressions and recessions. The worse the problem the more money it takes.

The banking laws were eliminated under Clinton. We didn't have to wait long for the disaster, we now call the Great Recession.