The wealthy already give back. They support massive charities. They build hospitals, establish research centers and found university chairs.
What they cannot do is support the poor. The more help the poor get, the more poor there are. The United States has the wealthiest poor on the planet. The poor have cars, at least one television set, they live with both air conditioning and heating. Normally, the poor in this country are clinically obese. Poverty being relative, the San Francisco Bay Area has as many poor, if not more poor, than the projects in Chicago. The difference is, the San Francisco poor make over $100,000 a year and scrape by on food stamps.
To the largest extent, the poor cannot be helped into moving beyond their poverty. They have a mind set that keeps them poor. Give them a windfall, no matter how large. Within a year, they will be just as poor as they ever were. This has been proven with lottery winner after lottery winner. The only beneficiaries of lottery winnings are already wealthy people on whom the winner wastes the money.