" one or more individuals takes it upon themselves to act hegemonically toward others"
Several individuals through voluntary interactions amongst themselves and with a sufficient group of the populace arrive at a governance structure, driven by their individual interests.
In other words in the pursuit of utility from the selectorate if you will.
I think calling it a hegemony is inappropriate. It's a selectorate, which necessarily involves compliance from a sufficient group of individuals in society (which will tend to involved a significant bulk of society, given the physical constraints of humanity).
So what you asking is how can extortion from a significant group of society be a positive force for social utility?
It can be a positive force for social utility if the selectorate is vast enough.
So essentially, your saying the more people that are extorted to the direct benefit of a tiny minority of society, somehow that increases social utility as a whole?
What??
That doesn't make any sense.