IMO, because they have so much money (what some comedians call ****-You money) they don't think or believe social justice and progressive ideas will affect them much. Most of the 1% could lose half their wealth to "give-aways" and still be richer than 90% of the rest of the entire world's population. The other top 10% wouldn't be too hurt either IMHO.
They'll still have their property (often walled-off and guarded), still be able to afford men with "permits" to carry weapons to protect them. They can still invest and profit from all the feel-good products/commodities Leftist ideologues allow.
It also allows them to virtue-signal, despite having "wine-caves" filled with expensive wines, and garages filled with classic cars or marinas with boats.
Perhaps also because some might feel a little guilty (ala Ebenezer Scrooge) from time to time so they buy a school a bunch of computers, or give a scholarship away. :shrug:
But some might be Democrats simply because not all Democrats are progressive-socialists. Many are simply Liberals, and can work with the systems established to seek changes, while trying to maintain or improve the socio-economic status of all Americans.
Recall, the Democrats have been in charge several times over the years, and while they have done some good things, they've also done "bad" things (per the hard Left) to the benefit of business, power, and wealth.