"Loyalty," Loki confirmed. "It's a complicated thing. Say for example your brother's son stole something from your cousin's lover, so your uncle kills your brother's son in revenge and your brother kills your uncle. Then your father gathers his army to avenge your uncle and your brother gathers his army in response. Which side do you fight on?"

And it was almost impossible to explain to most people that that was a very realistic scenario, if you were a Jotun with an Asgardian for a blood brother.