* Part of axod's idea, from what I gather, is simply to provide a nice chat system, that happens to have IRC as a backend. Would you say that people who can't install a proper nntp/smtp/whatever client shouldn't be allowed either? How 'bout twitter, to pick something popular? How about people who need help setting up an online store presence because they can't code it themselves? We owe the existence of this site to pg knocking down that particular barrier to entry.
Now, the question of abusive users is another one, and one that deserves to be taken seriously. But I have no idea about how axod handles that side of things.