Women do not have a deep ethnic identity, it is rather superficial. Kill all the men, females are easily assimilated. The ethnos will disappear instantly. This has been known since antiquity.
Therefore, it usually does not occur to anyone to kill women during genocide, because subconsciously everyone knows that a woman will accept any power and identity.
Women only follow what they see as the authority and they are easily manipulated. This is Any Forums101. When the perception of a society wants to be changed the first target are of-course women and children. Men and old people are the ones that must be killed but we do live in different times. Instead they just use women to manipulate men while completely ignoring old people using memes like "okay boomer". You see, it's cool to not listen to them.