While choosing to give most of your money to various charities, generally of your choosing and while you are still alive to see the benefits, is all well and good, it is very different from favouring having all your money being taken on death by a government you trust enough to use that money provide equal opportunities to all.
> "AFAIK the vast majority of the fortunes of Page, Brin, Zuck, Bezos et al. is "self-made" and comes from their companies."
For most of today's billionaires it isn't just an expensive education, it is family conenctions, e.g. Gates being set up with IBM via his mum, or family investments, e.g. Bezos, Zuckerberg, Page etc. having parents who gave or loaned them the money to start their companies (not to mention the safety net they'd have had should they have failed) - this isn't "self-made" in the traditional sense.