When I first got interested in politics, I mean really interested, it was about 1993, Bill Clinton was President of the United States President, and I started reading as much as I could about politics, both liberal and conservative, right wing and left wing, republican and democrat, and I analyzed the information I obtained and made a decision based on the facts.
The problem I had with the left wing progressive movement is that I could find little evidence to support many of their claims. For example, I can name ample evidence that tax cuts and supply side economics work, all you have to do is look at the administrations of Warren G. Harding, Calvin Coolidge, John F. Kennedy, Ronald Reagan and George W. Bush.
However, I can find no evidence to support the Keynesian economic claim that tax and spend policies boost and maintain an economy. In fact, I can find more evidence to the contrary. All you have to do is look at the administrations of Herbert Hoover, Franklin D. Roosevelt, Jimmy Carter, Bill Clinton and Barack Obama.
A lot of people like to claim that Herbert Hoover wasn't a progressive, although his progressive policies are actually the reason the name progressive lost favor with the public, and by the time FDR became President the name was changed to liberal, thus changing the classic definition of classical liberalism which was the opposite of progressivism (yet that's a post for another day.)
Many others will say that FDR worked to end the Great Depression, although six years into FDRs tenure the unemployment rate was still 15-20%. And the Great Depression truly did not end until tax cuts after WWII. Proof the Depression did not end even as a result of WWII is rations. If there wasn't a recession, why did we need rations?
I found little evidence to support the claim that a few experts (mainly progressives or liberals) in Washington know better as to how to run an economy, or a business, or regulate a business, than individual business owners. As history shows the more regulations on businesses the worse the economy gets, and the fewer regulations the better. Just compare the FDR and Obama administrations with the Ronald Reagan administration for your proof.
The minimum wage is another great example. Progressives claim a minimum wage is needed to allow such workers to maintain a quality of living. Although every time there has been a minimum wage increase the value of the dollar also increased, making that extra buck or two essentially worthless.
The proof is in the history. I can find no evidence to support that progressivism, or liberalism if you prefer to call it that, works. It has, in essence, according to history, failed every time it has been tried. It sounds good, but it fails. I have even read books with an open mind purposely to try to allow a writer a chance to change my mind, although not one author has.
The evidence is in the history, liberalism has failed every time it has been tried, and conservatism has succeeded every time it has been tried. The proof is in the history.