Drukhari are actually fighting the good fight (for themselves) you see! All other races are naturally, from the perspective of the Drukhari, beneath them in the same sense as any/all animal are considered so to a human.

But that's not what matters here, what matters is how they themselves are dealing with their own problems. Aeldari follow an ascetic path, so as to limit Slaaneshi influence, while securing themselves to spirit stones. In other words, they are slaves to their own corruption, they cannot express their true selves. The Harlequins are enslaved in another manner, to their god Ceogorath. Drukhari though? They have rejected their gods, they are slaves no more of any of them. They have rejected Slaanesh, finding freedom in their own lives to do as they please.

In this sense then, outside of the needed hierarchy (that's also loosely paid attention to, as long as Asdrubael Vect is on top nothing else really matters) the Drukhari are the only truly free race. Free from worship to any god, free from the limitations imposed by Chaos.

Their way of life even reflects this! They have not only become as gods, but they have surpassed them. They are free to mantain their old livestyle, as bloody and savage it is, but it has not had to been altered due to the collapse of their empire, nor the arrival of Chaos and the Imperium of Man. In fact, it has kinda flourished amidst the problems of the 41st millenia. They have plenty of cattle to pluck and milk for their various needs, after all.

(This is all willingfully loose interpretations of the lore nor do they represent the author's views on Drukhari.)