Not comparable at all. The Iranian protesters are/were a minority group within a country that itself makes up 1.1% of humanity.
I'm talking about morality here, not practical ability. The ultrarich have their circle of friends and family, who themselves have their own social circle, on and on until suddenly you're not looking at wealthy people anymore. Six degrees of separation and all that. How many people in the social graph can know about this extermination plan before the whole thing collapses?
Why would they take action to exterminate anyone, when they can simply ignore them and let them live and die in extreme poverty, unable to participate in the economy? The west already accepts this kind of poverty with the sweatshop workers, and nobody bats an eye.
It's just disenfranchisement. Only the people who try to use violence to replace the political leverage they lose when they lose economic leverage would need any action taken against them, and that's easy to justify as self defense.