Re: Gates
I'm no fan of Microsoft or (old) Bill Gates and his underhand tactics, but I'm not sure you can say he is doing this just to establish a legacy. For one, I believe he is remarkably reticent about plastering his name on everything, he (and his foundation) seem to focus on funding research and initiatives into coming up with solutions that kill large number of the world's poor in underdeveloped countries: diseases like Malaria, but also poor sanitation and lack of access to safe drinking water.
Not sexy, but major killers and things that is difficult to find commercial funding for, as they don't affect affluent countries and so from a money making perspective they're not attractive (what a cynical world we live in).
Could it be that he has simply decided that he cannot take it with him and so he wants to put it to some good use? (Yes, that would mean that a leopard can change its spots)
Also, both he and Warren Buffett have been encouraging other billionaires to follow this example through the Giving Pledge - guess who is one of the signatories? One Larry Ellison.
This is not to say this automatically makes these people saints, but I'll give them some credit for trying to use their obscene wealth to maybe improve the lot of the world's poor.
But we may at some point want to have a think about whether it's morally justified that one person amasses these vast amounts of wealth, and a society which seems to value that above all else?
Especially as it now seems that in the US you can use that wealth to sway elections - or in other words, not every vote appears to be equal anymore.