Amerliorating weath disparities
It occurred to me, probably in connection with this, that an apt response to growing wealth disparities, and to “the lessons of the 2016 election,” might be to deny government funding for the infrastructure and cultural amenities the wealthy disproportionately want until income taxation becomes more progressive, probably markedly so. (Also, taxing Teslas and other all-electric vehicles to help pay for roads.)
The people who are suffering financially are less enamored of those things (with the likely exception of streets and roads) and much less able to afford them.
It’s not a perfect solution, as the very wealthy can, if sufficiently motivated to do so, turn a lot of their cash flow into non-taxable form, but we’ll never attain perfection.