I definitely agree that the In-Game Chat could and should be moderated by a select few people who can be trusted with that kind of responsibility. Since the team for this game is currently small, especially. I have noticed overly-aggressive people as well both on these forums and in-game, which is not good for a game in it's infancy like this one.
I know a couple people who I think have definitely aroused some of the aggression. I won't name them, but I'm sure we all know who they are.