I agree with this fully. Even if you think there may be some sort of agenda, just enjoy the concept as a premise and roll with it. Because in that movie's universe, that's exactly what happened and it won't change. Also this is the cutest movie ever. Lots of ooo's, ahhh's, awww's, and laughs. To me, this tugs at the heartstrings harder than Finding Nemo. Although...I haven't watched Finding Nemo in a while. I'm so impressed that I remained focused on a full length movie whose main protagonists had little dialogue.
EDIT: Also, the soundtrack was really good.