What about democrats wanting everyone to pay their fair share of taxes?

IRS Failed to Collect $47+ Billion in Taxes from High-Income Individuals during Obama Admin

https://www.grassley.senate.gov/news/news-releases/irs-failed-collect-47-billion-taxes-high-income-individuals-during-obama-admin

Full text here:

https://www.finance.senate.gov/imo/media/doc/2020-06-04%20CEG%20letter%20to%20IRS%20(Rettig)1.pdf

Was the money just ignored and the rich got richer, or used/funneled (pledged) to other purposes?