I’m curious why you bring up the rare cases of matriarchal societies as a way to disprove the general thrust of the argument. The existence of a few matriarchal societies doesn’t disprove my argument that biology makes us patriarchal.
If I said Dutch people are taller than Spanish people you wouldn’t start talking about your one tall Spanish friend as a way of disproving my argument.
Something is making you clutch at straws to try to disprove the argument that biology causes patriarchy.
On the second point. Leaders take risks to get into the leadership position. That’s why the lower ranks are taking huge risks.