*sigh* umm.. to vf-25s, i think you're trying to complicate things more.. last i checked we were talking about an anime cartoon and not hatred and racism.
i don't speak for everyone here, but just to clarify, i'm not saying that the right thing for alto to do was to kill ai-kun. in fact, we have seen hints of this throughout the series leading up to this point that this (reconciliation attempt between vajra and humans)was gonna happen. what i am saying is, given the circumstances, alto's response to ai-kun is expected and understandable. it would have been extremely lame if at that scene, alto was all "ai-kun's a vajra? well jeez, i guess they're not so bad after all. sure i'll help you return ai-kun to his mummy!!" LAME. the vajra are ugly bug things that supposedly have no brains (can't be reasoned with) and they killed his friend and destroyed his hometown. just the fact that alto hesitated shooting when ranka told him to stop speaks VOLUMES about his character. if it were me, i would not have hesitated. remember, alto DOESN'T HAVE THE ADVANCE KNOWLEDGE THAT THE VIEWER HAS. this is the first time that it has even been suggested to him that the vajra can be reasoned with or can coexist with humanity. it should be obvious that it's gonna take some time for him to warm up to this idea. and while ranka's actions are courageous and bold, they are kinda rash and extreme as well. she still has a very limited memory of her past and very limited knowledge of the vajra, and yet she's gonna say goodbye and risk her life for her pet? and she expects alto to just be like "ok sure lets go!!" maybe she doesn't deserve the criticism she's gotten but she doesn't deserve praise either.