This appointment, like Trump's others, is no mistake. To "drown government in the bathtub" and gift the uber-wealthy even more wealth and power over peoples lives than they've already stolen from society around the globe, is Trumps MO and often stated goal (and goal of those who influence him - "it's no trick to feed fish to a seal").
Trumps stated goals are to reduce many taxes for the wealthy and corporations, regardless his "populist" blather and lies. Inheritance taxes, now with an exclusion over $5.4 million, would be eliminated entirely creating more and wealthier dynasties of greed; corporate tax rate, now 35% reduced drastically giving more power to dominate government protections for the vulnerable and environment; an income rate now just under 40% for the top rate further reduced - Trump & Co wants to reduce or eliminate all "burdens" on the 1%, making wealth inequality in America even more extreme, especially for the poor and fast-vanishing middle classes.
For every dollar the uber-wealthy and corporations evade, a dollar will come out of the pockets of the most vulnerable & 99% in one way or another! Such is the goal of the likes of the Trumps of the world - a pathology of greed and self-interest at the expense of everything and everyone else! The people of the world maintained under Vulture Capitalism (and "democracy" - the most easily manipulated/controlled system) as wage and interest slaves for those who control vast wealth living lives of obscene wealth & ease, while most struggle just to survive, like parasites on societies!
Ben Carson, like Trump himself, is a cog in the wheel of the domination, and corrupt future direction, of our world by great wealth, "growth" and profits above all else - even our Mother Earth's ability to exist!