Emily's Cat
Rarely prone to hissy-fits
As long as we're doing made up examples, here are a few:
"An unidentified assailant fled the scene. He is considered armed and dangerous."
"The pelvis of this skeleton indicates that he was male."
"Beth never met her father, always assumed he was a deadbeat."
In such cases as these, we use masculine pronouns because we believe the subject is male, even though we have little to no specific information about their gender role or identity.
Technically, we're only using belief in the first scenario, where it is possible that the assailant was a particularly buff and masculine appearing female.In the other two, it's not a matter of belief, it's a matter of observable reality. The pelvis is observed to be that of a male, and the pronoun chosen is based on sex. In the third case... well... I infer that Beth is aware of their own mother, therefore the father is required by evolution to be male.
