It's only a huge mistake if your goal is a rational fact-based discussion. If your goal is to cut taxes on the wealthy, then pretending otherwise is quite smart. Articles talking about income tax as if it was the only tax that mattered show up constantly, and it's not a mistake, it's a deliberate campaign of misinformation.

In FY 2018, total US government revenue, federal, state, and local, is “guesstimated” to be $6.66 trillion, with federal $3.65 trillion; state $1.67 trillion; local $1.33 trillion.

https://www.usgovernmentrevenue.com/total

With another 20% of state and local coming from income taxes. although obviously various by jurisdiction)

https://taxfoundation.org/sources-state-and-local-tax-revenu...

The fed revenue shows ~ 3.2 - 3.5 T

https://www.usgovernmentrevenue.com/year_revenue_2018USbf_19...

Sorry not trying to be an ahole just trying to dig up the numbers for accuracy.