BACKSTABBING FAMILY MEMBERS
Yes, we all have those family members, or in-laws we just can't fucking stand. This is a major advantage of being a barbarian. You just have to kill them and they are gone forever! No one will question your motives, because this is just standard procedure in the barbaric world.

Above, two barbaric cousins fight one another to the death! These two cousins have not liked each other since they were born, and finally, the time has come to find out which is the true man and who is going to die.
Below, something barbarians don't have to worry about. Why? Because there is no jail. All crimes are punishable by death, this saves barbarians lots of time since they don't have to deal with courts and other shit like that. Barbarians like to keep things simple.