Rampell cuts to the chase early.   The Trump plan is a redistribution of income to ownership, where a vague mysterious hand of the market will the lead those owners to direct that money to the benefit of the society.    Owners self interest is overcome by their noble character  of course and workers will receive raises and more jobs for everybody.   Just like it's worked the last 30 years. 

(Don't forget what Rampell points out, there are plenty of tax advantaged ways to spend the money that would offset the public tax's that might go to projects with wide public interest, like infrastructure).     Trump policy will just slice the pie in favor or redistribution to ownership and executive rewards.   Small investors will get just enough kick from a short term rise in stock value, that they won't notice the most of the distribution will be in the hands of 1) large investors 2) higher executive wages  3) the financial services industry collecting 'small' fees on huge transactions volume.