Usurpers seek support from the lowest classes to level society. [causal]
Here, too, is the purely sociological among the various reasons for the phenomenon that the usurper, who wants to dominate a society that is stratified by estates, usually tries to gain support from the lowest classes. For, in order equally to rise above all, he must level all; and this he can achieve, not
Georg Simmel, The Sociology of Georg Simm…, loc. 1955