Virtue doesn't scale. Hence taxes for public good stuff because otherwise only the town with a generous Moneybags would have roads or a fire service (and the town with a racist Moneybags would only have a fire service in the white quarter). It's also hard to coordinate - see disaster response.
We're talking simply about charity. There are plenty of wealthy liberals - like Hollywood, Gates, Buffet, Silicon Valley, etc. All the people who donated to Sanders. Plenty of money to give to charity.
