The end around this is convincing yourself that you’ll spend it better than the government would. There is a famous clip of Michael Dell saying as much at Davos.

Bezos and Musk think they’re saving the human race by deploying their capitol towards the pursuit of life in space.

Gates is attempting to make various diseases extinct.

Soros is attempting to bring about a world more closely aligned to the philosophical ideals that shaped his early education.

The richest of the rich usually have some pet project that they think is the most important thing in the world.