@Kaarme 1st, that was a very small portion.
2nd, they still raised him and took care of him. His father is still a demon.
3rd, the humans also have those kind of douches as well, but he still chooses to protect those important to him.
4th, he still had friends, and if the humans have their way, it's the innocent demons he cares about that would suffer.
@TNT261 It's actually perfectly normal. It gives us nutrition, it is a large source of food, and it's much more readily available. The reason breast milk isn't considered normal to drink is because in olden times (and even now) many woman couldn't actually produce enough for their kids... so drinking one of the few things the baby could drink was considered wrong.....
It wasn't unusual for children to die back then.
So between cows milk which could be harvested in quite large quantities and give humans the nutrition they need vs a very limited milk that was needed for babies to survive, it's obvious which one humans would drink.
As creatures, we humans are being that survive by taking nutrients from multiple sources.... so what's actually weird is when we don't eat other foods good for us just cause we find them strange...