It would have been simple to worry about normal problems. But being a werewolf put in the wrong house while a Basilisk is on the loose under the control of three possible suspected Parselmouths? Impossible.
The Coppin siblings were unhappy to say they were completely normal magical children. Then they somehow manage to get caught up in Harry Potter's problems. Normalcy lost.
The clans are clueless of the darkness even the stars could not see coming. We know, though. We, the accused, the outcasts, and the lonely. And we have the elemental power to stop it. Why save a group of cats who have been nothing but cruel to us? We have our reasons. What better way to say "I told you so" than to save their very lives? Of course, it isn't the only reason. Is it?