It's not uncommon to see two youthful brothers fighting. On the way to dinner, they push each other to see who gets there first. At the table, they argue about who got the bigger piece of pie. On the way to the park, they fight about who will carry the football; it never occurs to them to agree to let one of them carry it to the park and the other back home. There is no interest in "reasonable" solutions; it's all about contention. And sometimes the contention gets excessive.