You'll also enjoy reading Lawrence Reed's article, "Great Myths of the Great Depression," posted here long, long ago by a FReeper who is greatly missed for his thoroughly researched contributions to this forum.
The natural tendency among Republicans is to blame Roosevelt for all that went wrong from 1929 on, but Reed shows that much of the groundwork for the New Deal had been laid during the Hoover administration. Roosevelt just added to it, with the connivance of a Democrat-controlled Congress.
No question that a great deal of damage was done by Hoover and the Congress at the time. In particular the Smoot-Hawley Tariff Act passed in 1930 was the stupidest piece of legislation passed by Congress in the first half of the 20C.( and it had some strong competition) However FDR ran on a platform that he was going to do a lot of good things and then when elected promptly did all the wrong things in spades. In essence he set up a fascist/socialist state. The FDR administration virtually nationalised most major industries by forcing them into Government cartels. Hoover did a lot of damage but it pales in comparison with what FDR did.