Better for the dregs of society to rise to the top by cutting down their betters, and dominate a poorer society, than stay at the bottom of a richer society. It is simply an understanding that the only ticket to realize their ambitions is to utterly destroy their betters, partly driven by real or imagined historical grievances. Society can corrupt a person, that is true. And that is what they know and is their truth.
But once they are all that is left at the top, they'll change their ways and become conservatives.