We know they hearded them off cliffs in many parts of the world, probably egged on by throwing spears and jabs.
It seems pretty unlikely they'd have regularly risked death by planting a spear and waiting for a charge. It's not like a multiple ton animal is going to be stopped by the spear.
The answer, as always with extremism, comes back to indoctrination, disenfranchisement, and finally, radicalization.
There have been tons of studies in this, but at a high level, men are indoctrinated by constantly being put under a lens of toxic masculinity by their peer groups and male role models.
Then they become disenfranchised from "mainstream" ideals, not hard to do with the mental health crisis and wealth disparity we see in the world every day. Or the simpler method of being raised in a small community (a church or small town) where such progressive ideas are frowned upon and demonized.
And finally, they search for meaning and inclusion in an 'in group'. This is natural human behavior, and is preyed upon by a laundry list of bad actors who are all too happy to offer answers, meaning, and most of all, some nebulous group to blame and attack for your problems. This step in particular has become easier and easier for more extreme groups with the advent of the internet.
It's a vicious cycle. And that's not to say the victims here are blameless, because of course they made their choices along the way, but they are indeed victims.