In Capitalism every individual is a steward of the economy, and the amount of wealth they have accumulated represents the portion of the economy that they're in charge of. The great thing about Capitalism is that most people accumulate more wealth through actions which grow the economy, and as a result the people who are the wealthiest are the people who're best suited to grow the economy. Certainly, there are individuals who can "game the system" to build their own fortune without actually contributing anything of value, and it is reasonable to try to prevent these tactics from working through regulation and oversight, but they're generally in the minority.
Now, the consequence of this is that individuals who mismanage their portion of the economy generally see a reduction in wealth; and repeated mismanagement will result in poverty even for people with very large sums of money. Consider the number of lottery winners, or celebrities who declare bankruptcy after having tens of millions of dollars; often being enough that they could live in luxury for the rest of their life without ever working, and then their children children could inherit enough money to live in luxury, and so on.
With that said, most efforts to redistribute wealth do not increase the standard of living (and often decrease the standard of living in the long run) of people who it is supposed to benefit, while it tends to act as a drain on everyone else.
