Not sure how you came up with that. No, I'm for significant tax increases on extremely high income. What I was saying is that change to the tax code is needed because depending on the good will of the rich is just about the most naive idea ever.
That implies that the tens of billions of dollars spent by the rich on charitable donations wouldn't make an impact if given to the government, doesn't it? If that's the case, why tax them for that amount?
The 2019 federal budget was $4.407 trillion. let's say we're talking about $20B in voluntary tax overpayment (good luck with that!), which would represent .004914% of the budget. That would pay about 3% of the interest on US debt in the last year. It would change nothing.
However, increase the marginal tax rate and you're talking about real money. Maybe in the meantime we can spend a little less on the military, but that's a tough sell too.