A lot of it goes back to the abuses of power by the trusts, back in the day, though our fiscal and monetary management systems have changed completely in the meantime. Still it has to be said that the private sector did not exactly do itself any favors with the record it created in the golden age of laissez-faire Capitalism.
Our corporate tax rates are kind of a fiction, as fraught with loopholes, special credits, and above-the-line deductions that our Goldbergian tax code has created over many decades of insider dealing between big business and Congresscrooks. On paper it may be the second-highest in the world, but like Greek or Italian personal income taxes, neither their citizens nor our big corporations really pays that. Look at GE, one of the foremost megacorporations, earning billions but with a net corporate income tax of ZERO. I question whether any comparison of them to overseas rates is actually meaningful unless the overseas tax code is as completely eaten up with trap-doors, loopholes, and escape hatches as ours is, and I don't think many of them are.