Like what? Extreme wealth, if used within industry, has a lot of benefits to society, including the working classes: the created industry creates jobs, which enhances spending, which then benefits the economy, which brings in more taxes for the government, which benefits the support systems for the poor & disabled.
I'm not saying that there's absolutely no need for private industry, please do not conflate this point.
My argument is that the free market has failed in the sort of wealth distribution required to keep societies needs and wants met.
Look at this graph:

Are we going to pretend that this isn't a thing?