Do high earners consume progressively more proportion of their income in public resources than the poor? Why would you jack up their tax rate? Also note you picked the literally only one of 11 states in [0] above California that is (R).
Edit: my context was about taxes in general not specific enough to SALT
“High earners” includes capitalists; one of the reasons the SALT cap hits hard in California is that California not only has the highest high-end income tax rate, it (unlike many states and the federal government) taxes capital gains as normal income, not at a reduced rate. Both parts of this policy are things that the SALT cap is designed to put pressure against.
The SALT cap, not the state and local taxes it targets, is pro-capitalist and anti-worker.