It's already been explained why the Kyuubi attacked the village back then:
http://www.onemanga.com/Naruto/386/11/
Although, in reality, only Sasuke knows it.Jaraiya suspected something, and Naruto knows 'someone' was behind the Kyuubi's assault on the Village via Minato.
http://www.onemanga.com/Naruto/370/15/
http://www.onemanga.com/Naruto/440/08/
Hahaha. I liked that. I'm also inclined to agree with you on that statement. 3rd alternative: Perhaps, over time, all them "living" in Naruto's mind as it were, got to know each other. As for a fourth possible reason .. I dare not speculate.
What I am impressed about is that Kushina can close off her conversations with Naruto so that the Kyuubi can't overhear. Just like Minato. This to me suggests that there really is something special about her.
http://www.onemanga.com/Naruto/440/04/