Because there are many ways it can play out.
One of the obvious - if rich are too uncomfortable they flee the assets out of the country and the amount of taxes collected drops -> all middle and low class is left to compensate for it.
As far as i know similar dynamics already happened in various places throughout history.
But dumb marxists are incapable of thinking about anything productive or creative to solve the problem, they only think about how to take someone else’s.
Partially because of low intellect (i.e. inability to calculate multiple steps forward), but mostly because of the scarcity mindset, thinking about life as a zero sum game.
We need to be better than that.