There is natural concentration of wealth and there is an unnatural concentration of wealth. Thomas Jefferson and James Madison used to correspond about what to do about the unnatural concentration of wealth. And one of Jefferson's solutions was to propose a progressive tax. But not to the extent of choking production to death/.
Getting rich from building a better mousetrap or making Hollywood movies is a natural concentration of wealth, and there is nothing wrong with that.
Taxing the rich more to mitigate the unnatural concentration of wealth is the simpleton's means of treating the symptoms instead of the disease.
The unnatural concentration of wealth, the tilting of the playing field, is being accomplished through government legislation. So the obvious cure is to fix or delete the legislation which is tilting the field.
If your house was being robbed on a regular basis, and the police were providing protection to the thieves, how retarded would you have to be to say, "To solve this problem, we need to tax everyone who lives in a bigger house than me more"?
You'd have to be as retarded as Bernie Sanders.