arguing should be in the base game

I don't agree it shouldn't be a "mean" interaction. Arguing is not a rational discussion or a respectful debate. It's a heated and often angry exchange between people who don't want to come to an agreement at that time. We are all like that sometimes .. and I guess after the dust settles you can see the points better so it can end up being a good (venting) or at least human thing later but it's still not a pleasant thing to engage in unless you are wired to enjoying it.
I don't really have an opinion on it being in the base game. It was part of a pack that expands the game.. Maybe the next base game should have it though.