I can't really call destroying the Borg genocide. Granted, all of them are assimilated people, but with a few exceptions, it's almost impossible to de-Borg them. (They never should have allowed Janeway, Tuvok, and Torres to be de-Borged so easily. It completely cheapened the terror and horror of being assimilated that we first saw in FIRST CONTACT.)
I think it comes down to this... destroy an enemy that has no sympathy, remorse, incapable of redemption or reason, and have not just assimilated billions of people, but have also killed billions more. Quite likely trillions between murder and assimilation. And they will keep going until ALL life in the galaxy is Borg. Hell, they started going to other DIMENSIONS to assimilate more races, which of course backfired.
Or allow them to keep doing it.
They have to be stopped, which was why I was very much with Admiral Necheyev when she talked to Picard.
But that is another topic and I don't want to derail the subject of the thread, which already spurs great debate.