The cause of corruption is power mongering by incompetent persons.
The Fraud of Tax Give-aways
Before 1981, when conservatives took over the world, corporations were paying 60% of total federal revenue. Now they pay 15%. America was great when corporations paid taxes. More of the conservative tax give-aways is not going to get back there again.
As always, there is an ulterior motive for the fraud. The purpose of never ending tax fights by conservatives is to use taxes and deficits as an excuse for ending social programs for the needy. Conservatives are fighting a war against the needy and they use taxes as the pretext.
The claimed purpose of a tax give-away is to stimulate the economy, so "all of the boats will rise." The needy will supposedly be better off if the rich get a tax give-away.
When are all of the boats at the same level? There is no such economic concept. Supposedly, a tax give-away will stimulate the economy and benefit everyone. That isn't how economies are stimulated. Economies are stimulated through spending, and they can get "over-stimulated" awful easy, requiring a "cool-down." Taxes are never a part of the process, because their influence is nil.
Trump's fixers decided that Trump will "jump start" the economy through tax give-away. Since the insurgence of
Taxes were not supposed to have been collected in the first place, if they weren't necessary. If they are necessary enough to collect, they are supposed to be used for the necessary purpose.
So conservatives disagree on the necessity. The necessity is a specific question about programs, not an question of economics. Conservatives don't want the government to produce social programs, so they waste the money and try to give some back as a means of defunding social programs.
The economic fraud of tax give-aways is that the persons who pay taxes always spend as much money as they are ever going to spend on necessities. Any tax refund just goes into investments or savings, which do nothing for the economy. Making investors more irrationally exuberant doesn't fix the economy. If the money were given to the needy, they would spend it on necessities, which would have a slight economic significance. But benefitting the needy is what conservatives try to avoid.
The concept of jump starting the economy is a sixties concept. There has to be an economy before it can be jump started. Now days, spending money on products will only jump start China's economy, not the US economy.
The fraud of it all is that after the squandering through waste, fraud and abuse including tax give-aways, conservatives pretend that they must scrape up pennies by cutting social programs for the needy. No one benefits from the tax give-away, and the only result is a war against the needy.
There is such a thing as too much debt, though wall street likes quite a bit of debt, because it collects interest on it. Conservatives only notice that there is too much debt when they are taking from the needy. Otherwise, there is no such thing as too much waste, fraud and abuse.
The problem of too much capital
The only allusion to a purpose in giving tax payer's money to the rich is to make more capital available, so they can alleviate the shortage of toasters and paper towels, which corporations cannot afford to produce at this time.
There is such an excessive amount of capital available that there are negative consequences. The most obvious consequence is the "irrational exuberance" driving up the stock market, so no one really gains anything from stock investments. But there are also numerous less visible consequences. One is bankruptcy of the banks. The banks need to loan money. No one needs to borrow money with such excessive capital available, except the most indigent borrowers who have low probability of paying it back.
Another negative consequence of the excessive capital availability is investment in fantasies. If people want to entertain themselves pretending that junk technology, such as "renewable energy" and carbon-free, self-driving electric vehicles are going to solve their problems, the usual assumption is to let them spend their money however they want. Tax payers are not investing much in those fantasies. But there is some real social decadence that comes out of that process.
The negative effects of investing in social fantasies are like a disease upon society. They corrupt the science and technology. They increase the cost of electricity creating a significant burden upon the lower classes. They block progress in developing real solutions to problems, such as cheap and safe nuclear reactors. And more than anything, they railroad the purposes and resulting thought processes of society away from rationality and toward imposition of destructive behavior upon everyone. The shape of the earth is being revamped to promote the fantasies.
Another bit of fakery (Rationalizing a war against the lower classes is the only purpose.) is to pretend that tax reductions will draw corporations back into the country. There is already a shortage of workers, so why more corporate activity? Word salad for rationalizing is the only purpose.
Corporations are globalized now days and none can survive on a small, domestic scale. Shrinking corporations to a domestic scale is like trying to put a ten pound watermelon in a pickle jar.