Monsters vs. Aliens/大战外星人

Some monsters helped the humans to defeat the intruding aliens? well, sounded a little weird and sense of black humor, wasn't it? It was understandable because the monsters were actually humans or something which had belonged to humans, it was reasonable for them to offer assistance to the human. However, did they realize that they would never regarded as part of the human world? How did they position themselves? and what if they had to face discrimination from some guy they endeavored to protect? Of course this was a happy-ending movie and none of the questions above seemed a bother, yet, fairy tales were too perfect to be trusted as they had many problems.

And here was another logic paradox of the movie: when the girl expanded her body, should her bra/underwear/pants expand with her too? This is a Hulk-type mistake, yet of course we would ignore it considering its young audience.