Just like you don't think it translates to rage, these people think it does (anger against the injustice of the world). Like I said a lot of times already, you can't reason yourself out of this or use anecdotal evidence (including our own history). That's the point.
This just shows you its super contrived because you keep making this setting is built to go through a check box you wanted filled out for it to work. The concept of Fathers cannot exist in this theocaracy in order to not have male barbarians even though that puts more strain on the single mothers raising their children alone and puts a strain on the entire society trying to maintain a reasonable population level for the next generation.
Mothers only being allowed to be barbarians and a MILITARY faction not trying to even see if other women who haven't given birth yet can't draw rage from other forms of loss is stupid because any military wants to have more numbers.
Resources are harsh and scare that they limit births and keep the population on as close to a downward trend as possible whats to say stop the orcs from out-breeding them in a few generations and stomping down on this civilization with superior numbers. But apparently no one in this Theocaracy thinks about that because "reasons."
Saying that the orcish tribes/states are smaller is no justification as the only way to keep their numbers down is genocide and again for your setting you say there a huge taboo on killing humanoids that its avoided whenever possible.
Like god damn that whole "lol angry nerds" comment really makes me start to suspect even the reason why your pushing so hard that only Mothers can be barbarians is that your trying to bring up your whole "only women who have the ability to give birth are real women idea" from that other thread but under a mask.