What you say is reasonable in theory, but grossly ignores the actual history. E.g., the 2017 tax cut was an enormous giveway to corporations and the rich: https://qz.com/1769421/trumps-tax-cuts-and-jobs-act-shows-po...

And a lot of that money is being borrowed, so it's even worse than it seems at first blush. Not only are the rich getting richer, but we'll all have to pay for it eventually. So recent history is the government doing the opposite: they were giving away money during the boom, making it harder to do countercyclical interventions in a crisis. And this from the supposedly fiscal conservative party.