If you don't see why wealth inequality is a problem then look at biodiversity for example. It's generally accepted that wider biodiversity is better for everyone, and efforts to conserve a wider range of diverse species rather than a smaller number of better adapted species are encouraged. Now apply this reasoning to businesses. If wealth were redistributed better that would mean more chances for people of the lower end of the spectrum to innovate and produce small businesses which would lead to wider diversity and resilience in the economy. Which ties in with your small team example.
As for 'capitalist propaganda'; for example, considering higher wealth tax rates for the top end as 'crushing those who generate wealth' is pretty clearly capitalist doctrine to me. It's the kind of narrative that wealthy people in positions of power sell so that they don't have to redistribute that wealth. I agree with you that people at the high end should have incentives to innovate and I am not advocating communism. However as far as I can see, with properly globally enforced taxes at a higher rate for top end wealth there would still be plenty of incentive for these people to innovate.