All those arguments were made at the time. More economists than not agree it was a reactionary bad move. Just ask Jimmy Carter, who had to spend his whole presidency cleaning up after Nixon Shock.
Would you be a Democrat or a Republican voter in 1910? Do you support a national minimum wage? Unions? Labor rights?
Yes.
No. Libertarians (RNC 1929–) dropped top tax rates down to 24% in 1929 though. Not that they were even paid that.
A year after raising it back up to 66% (1932) the economy started bouncing back.