I'm not arguing against billionaires. I'm arguing that billionaires make most of their money through investments and those investments are taxed at a lower rate

I'm not arguing against billionaires. I'm arguing that billionaires make most of their money through investments and those investments are taxed at a lower rate than labor, where most of the middle class makes money through labor. If the wealthy can keep a few percent more of their income year after year then you end up with the inequality I'm pointing out. We can have billionaires and fair tax policy. Trickle-down does not work.