Naw, it's a short explanation.
In the SoT setting, there are beings called "Confessors". Named as such because when they release their power into another living thing, the person affected falls into love so hard that they become a slave. They answer any question, follow any order, and even willingly kill themselves if the confessor so wishes it.
As a balance, releasing this power causes the confessor to be drained/weakened, sometimes to the point of being rendered unconcious. The stronger the confessor, the shorter the "recharge" time they need inbetween the use of their powers.
Male confessors do not have a recharge time. Thus creating a person who can enslave entire races with just a touch that are loyal until death. This power is permanent, just like the female counterpart. That much power corrupts a person, and huge wars were known to have been started by male confessors simply because they could.
As a result, the ruling wizard/confessor's deemed male confessors to be an abomination and a threat to everything living. If they're found to be male (as the power is passed on through the mother 100% of the time), the child is killed as soon as it's born. I think the book described the actual method too. Something about a steel pipe being laid across the child's throat and stepped on to break the spine and crush the windpipe.
**Edit - the lack of compassion stemmed from basically getting whatever they want, and seemed to be a trait only associated with the males.