You’re projecting your ideal onto a party which relies on the very wealthy to fund their politics.
I’m not talking about the rich, because while they wield outsized clout in what their parties do, they’re a tiny percentage of the population and consequently voters. All I’m saying is the vast majority of dem voters (they’re not wealthy and they don’t benefit from the grifting that the majority that the dem pols do) are willing to criticize dems. The opposite is not true–most GOP voters, who also don’t benefit from anything the GOP elected does, will never speak a word against the people in office.