The point about Trump and taxation is that nothing really changes in that matter as he accepts the most outrageous forms of taxation such as income tax or VAT. He will not get rid of them and even approves of a progressive form of taxing individuals/corporations.
Except ... there's centuries of economic knowledge encoded in how we do things. All the rich countries have high taxation. Low tax countries are all dirt poor, or they're merely trading ports (or tax haven scams) which rely on trade with large nations nearby. If you look at poor "communist" nations they all in fact have pretty low government spending per GDP. Wealthy capitalist nations in fact have high taxation and spending, which maintains a high level of economic activity.
If there was a finite amount of money and no taxation then the rich would accumulate all the capital and there would be very little turnover of capital. There would be price deflation, because there would be cash shortages in the regular economy, and this would effectively make the rich even richer (having all the money and it buys even more stuff), giving them no incentive to stimulate the economy.
If you spend a dollar, you grow the economy, if you take a dollar away, you shrink the economy. But
what you add or remove a dollar from has a different effect. This is called fiscal multipliers. And basically out of necessity, the structure of spending and taxation has resulted in many of the things we spend money on having high fiscal multipliers and taxation on things with low fiscal multipliers. This is all justifiable purely on macro-economics and seeing the government's job as being to grow the economy. Tax breaks for billionaires have a very poor fiscal multiplier, while food stamps have a very high fiscal multiplier.
If you slash billionaire tax rates and save the money by scrapping the food stamp program, you crash the economy and destroy millions of jobs. If you provide food money for the poor, then jobs are created feeding the poor. Many jobs are created per dollar spent. if you take that same money and give it to a billionaire in the form of top-end tax breaks then a
few jobs are created for accountants. This is just basic economics, whether it's the right thing or not to feed poor children isn't even factored in yet. You spend money on things that create many jobs and take money away from things that create few jobs.