On the other side of that coin, hear the rant from the exploited philanthropist. Why should it be left to me and others like me to bear the whole burden of feeding the poor/providing healthcare to the indigent/building the new town hall? Joe Bloggs has just as much money as me, but the tight-fisted miser won't part with a penny he doesn't have to. It's not fair!
Too damn right it's not fair. Voluntary charitable contributions from the wealthy could support the system even 100 years ago, when social pressures (noblesse oblige, and all that) could usually be counted on to see that most of the wealthy did their bit. Not now, I fear. Too easy to be a Joe Bloggs, and just hang on to the stuff. While you, or at least your family and employees, take advantage of the philanthropy of others.
Hence this peculiar, commie notion of taxes. Because it's fair. Sure, you lose that lovely philanthropic glow you get when you donate money (or goods or time) on a voluntary basis, and instead you get a mean-spirited resentment of the compulsion. Or at least you do if you haven't thought it through. But it's fair, and it works.
Get over it.