For sure everyone does their best to minimise the taxes they pay, but when you are the richest person in the world with some $200 billion, maybe you should be doing silly schemes like charity for tax avoidance.
Heck I tend to minimise my taxes, but often I don't even have such opportunity. The best I can do right now is contribute to my pensions. I'm on a current tax rate of around 50%. Outside that, there's not a lot I can do to minimise the tax I pay. Compare that the rich, who through their lobbying, and their schemes have paid an effective tax rate of around 3% over 5 years.
My statement is ridiculous to the rich, not so much to the rest of the population.