I'm going to have to agree with the third one down. The smartest way to get the rich to help society isn't to tax them. It's not. Honestly.
No, it's guillotines. Guillotines are the smartest way to get them to help.
Think about it. If we were to get bozos, furckerberg, theil, and muskyboy in a big stadium then guillotined them all that would definitely make things better instantly. However if we then said, "Hey, all you other billionaires, you've got a year to actually do something decent... or we will be coming for you", then the guillotining would be a gift that keeps on giving.
(Hell, I'll even volunteer to pull the guillotine levers so no one else has to deal with that guilt)