Are you saying that people who don’t earn few millions a year are doing nothing? Mind you, the majority of people are in this situation and contribute a lot to the society (teachers, doctors, researchers, any workers really). I’m not a leftist but I recognize the concentration of money in a few hands is probablematic, and a lot of business models to get to this point are harmful to the society at large.
The countries with higher teacher salaries, like Canada, or in our general vicinity all have low corporate taxes.
There are things we need to fix in the US, like people who don’t have healthcare, and the housing market. (All the losses in the share of GDP of labor since the 1980s went to landlords, not capital owners.) But it’s not clear to me that income inequality is in and of itself something worth fixing, at the risk of novel measures that could give other countries a competitor advantage over us.