I don't buy the slippery slope argument here, but I'll take it at face value. Good. Taxes have been declining for decades -- in the 1950s the highest marginal tax rate was like 95%. Now, even with a progressive tax system, in practice when all the dimes are counted it comes out to basically a flat tax[1][2] except for the billionaires who pay less than the rest of us -- now even lower than working class workers[2]. If increasing taxation reduces wealth inequality, so be it, even if it affects me. We all pay a price to reap the benefits of our society.
[1] from the book Triumph of Injustice. If I recall correctly, all taxes added up comes out to about a 30% flat tax for everyone except billionaires. https://www.goodreads.com/book/show/45894166-the-triumph-of-...
[2] https://sven-giegold.de/wp-content/uploads/2020/03/europe-ca...