If he's a left-winger, he obviously wants them to pay more than that. Though really, any tax system that isn't a flat dollar amount is truly 'unfair' to the rich, who benefit much less from the government. I suppose even a flat dollar amount would be unfair in that regard.
But you know, you have to be practical about these things.
I think Mexico is about the only 1st world country with lower taxes for the rich than the US.
Russia. Estonia and otebhr eastern european countries. switzerland.
I dont know if this qualifies as 1st world, but Syria.