The trouble is the proportion of those who have the highest technological leverage and are engaged in rent-seeking rather than wealth creation. The 1960s physicist was creating wealth they couldn't capture, while the 1990s physicist was capturing wealth they didn't create. If physicists (and other Ivey grads) all only chose wealth-creation, we'd see far less inequality (at least outside the Bay Area). The trouble is the pull of the largely zero-sum (or negative-sum) world of finance, which more than startups has increased the pressure to "make your fortune". Inequality begets more inequality, because when half my cohort is suddenly making 10x more than me, there are real consequences to my own social, personal, and civic life.
This is all on top of the relatively novel wealth imperative introduced by the progress of biotech. It used to be that, beyond a certain point, money only really conferred social status (and even then, only within a certain peer group): if I don't care about status within that particular group, then why should I care about making more than (say) $200k/year? Except now, with the rapid development of fancy unaffordable therapies and med-tech devices, having an extra 10 million $ lying around can have a much larger impact on quality of life than it did even a couple decades ago. And then there's the significant (if small) possibility that, if Kurzweil + co. end up being right, a bit more wealth might mean being able to "live long enough to live forever".
Current tax policy is heavily skewed in favor of the already wealthy, and wealth inequality is currently orders of magnitude worse than income inequality. So rather than just asking everyone to get comfortable with it, why not do something to actually address it? We need to make significant adjustments to (a) strongly discourage rent-seeking, (b) encourage those with the highest technological leverage to make the most of their talents, knowledge, and access, and (c) greatly increase everyone's ability to create, capture, and save wealth.