No , Indo Europeans populations didn’t kill 90 percent of the males of the territories they went through.

Sorry for the rant .

Peoples often hear things like « 90 percent of a population paternal halogroup is from a certain ethnicity » and immediately think that this mean that 90 percent of their male ancestors were from this ethnicity and that they killed 90 percent of the natives.

In practice , that just mean that you have at least one male ancestor from this specific ethnicity group through your father side. 90 percent of Mestizos in Mexico for exemple have European ancestry through their father side . This doesn’t mean 90 percent of natives men died (well they kinda did but so did the women)

Yes it is very possible the Indo Europeans population genocided/fought against the natives . But in practice , it’s more that the populations mixed with Indo Europeans men , not that the males were massacred .