I know you are talking about marginal effects but you should be talking about aggregate effects. You make the claim that a $1,000 donation might be more useful

I know you are talking about marginal effects but you should be talking about aggregate effects. You make the claim that a $1,000 donation might be more useful than many millions of $1,000 donations. This is clearly false. It’s true that the marginal effect of the first $1,000 donation is greater but you can’t conclude from this that the aggregate effect is greater. Mentioning diminishing returns is irrelevant when everyone you are responding to is pointing out that a single person voluntarily donating extra taxes is not worthwhile but at the same time think increasing taxes on everyone in a given bracket (due to scale) is worthwhile. Your emphasis on marginal vs. aggregate is why you are wrong and why your statements are wrong.