The point is a guillotine somewhere else is good. Guillotines at home don’t particularly hurt the rich as a class. (It’s debated whether France’s elite actually consolidated wealth and power through its revolutions.)
> socialist revolutions in China and Russian Empire had definitely hurt the rich
Communist revolutions hurt the rich. As you say, they sowed the seeds of a new oppression. (It’s difficult to see how one could avoid that. If you put a group of people in charge of choosing who to execute and what property to take and give to whom, you’re going to have a tough time clawing that power back.)
Broadly speaking, people angling for violent revolution in America are idiots. The rich ones who count on winding up on top take for granted the quality of their lives in a democracy. The ones who aren’t billionaires, broadly, are historically illiterate about the direction wealth concentration flows amidst violence.