Kogarashi isn't the bad guy here. If you look at all his interactions with the girls, he's been trying to give Kino a sense of purpose to hold her sanity in her grimdark reality.
He knows that Azu doesn't really need one. She's having fun and indulging in her immortality. Kids like living wild and they believe they're invincible. Azu actually is, and she's living her life secure in that invincibility.
Kino, however, isn't, and she's been forced to carry the burden of Azu's immortality. Kogarashi knows that, and he's been throwing every justification he could think of at Kino in the hope that one would stick and give her a reason to keep on fighting. It's unfair, but it's equally unfair to him because he DOES see them as kids despite what he tells his subordinates.
Also, I like that he isn't the typical edgy Gendo-expy. He actually carries his own weight. It's funny that now we know the reason he has that emotionless look all the time is because he's thoroughly drained from constant exhaustion. That isn't a persona. He's just your typical dead-inside bureaucrat.