It is said that people can do whatever they want with their own money. However, this money could have been better spent in activities like real scientific research or promotion of human rights (just to mention 2). The concept of redistribution of wealth would not have allowed something like this to happen. It would have allocated those resources somewhere else, in the form of road maintenance or school construction (just to mention 2) through an effective taxation system. Morover, it would not have allowed a single person to accumulate the mentioned amount of money.
If you do not believe me, take a look