I took "Harry's parents come to Hogwarts" as a completely insane move

Hum, well, if you think like a general wanting to win a war, yes. If you think as a teacher preoccupied about a 11-yo boy's mental health after he literally saw his best friend bleeding to death in his arms, fetching the boy's parents feel like the thing to do. And my own mental model of McGonagall is more that of a teacher preoccupied with a child's mental well-being than of a general.

McGonagall is upgrading herself and questioning her previous stances, but still, she seems like the only one who actually cares for a Harry as a child in distress, nearly as much as she cares about the war.