Board Thread:Questions and Answers/@comment-29602226-20160818165457/@comment-29602226-20160820012417

There is an Inquisition in the MGE verse. Those books are forbidden, their possession being a crime. It's in the first page of the MGE I: Their possession is restricted to a few, who are forbidden to show them to others or to share the information inside.

My assumption is that the soldiers are told a nightmarish version of what the Mamono do, to encourage them to fight more fiercely and not waver, and that's all most of them know.

Later the soldiers face the Mamono and see that they aren't monsters... save those who DO look like scary monsters.

If the first Mamono they meet is a Succubus, they will have doubts. If the first Mamono a squad meets is an Oomukade they will probably kill it and go back home telling that the Mamono are as scary as the stories say.