Yes, lets ask the top 5% to pay even more than half of all income tax.
Top?
Do you mean "richest?"
I suppose if a group earns 50% of the money in the country, and owns 50% of the wealth, they could reasonably be expected to pay 50% of the tax. Or 60% and 60%. Or 70% and 70%. Don't you?
I wonder how much the richest tax-dodgers pay.