I guess I don't understand your point then. Yes, it probably wasn't great to force Fighter to let Jeremy join, but Fighter was the only one who had a problem with it, the rest of the table was quite glad to let the younger kids in. And like I said, if the in-character fighting is fun for all parties out of character, more power to them. Its just when you do what Fighter does and use in-game violence to deal with out of game issues that it becomes a problem. Its not even that Fighter was forced to accept Jeremy that causes the conflict, he's just bitter, jealous and a jerk.