Not many Presidents had the guts Truman did. He served his 4 years and went back home.
He said “the buck stops here” and it did. He took the unprecedented action of dropping the bomb/bombs to stop a war from being carried out by our military on two fronts.. he said we were war weary and had lost too many men and did not want to fight another one in the pacific. It was a hard thing to do, and today the liberal media/left would have a fit . they are too used to having it all and no sacrifice.
Check your math. He finished FDR's 4 years (minus a month or so), then did 4 more years after Dewey defeated him in 1948.
Looks like 8 years before he went back to the haberdashery.