They are able to choose to do those things because capitalism has created massive surpluses that allow people to survive on a relatively small amount of labor. This creates a surplus that can be directed towards leisure or given to the less fortunate.
> Capitalism doesn't fuel everything.
Its true there are a handful of susbsistence level societies that do not rely on capitalism for anything but they are in danger of being assimilated and exterminated. [0]
> The problem isn't social norms. The problem is untethered capitalism allows concentrations of wealth and power with no check on it.
While I disagree with you that is an accurate statement of the facts; surely you can see that allowing concentrations of wealth is a social norm that you consider to be a problem.
> Those capitalists then stoke fascism to retain power once material conditions have decayed enough due to that concentration of wealth.
The material conditions that result from capitalism are widespread prosperity; conditions deteriorate when the oligarchs convince you to allow them to use the government to redistribute the wealth of the middle class.