First of all ...... there is nothing wrong with comparing to different animes, Kira and kenshin are not two different ppl but rather to of the same. If you watched the anime like i and many other ppl have u would realise they fight for there own beliefs and ideals aswell as protecting their loved ones.
And as for AA interfering in battles.. wtf does that have 2 do with anything.. EAF and Zaft soldiers battling are gona die anyways from either side so why not interfer and make it worse for them. And since u bitch about shinn so much lets make it clear to u! --------SHINN beat KIRA! yes ! we knw! he whoops his sorry ass!---------- Shinn does have the ability to take out kira, but what gives him strength is shinns hatred, anger,sorrow and pain! thats his power! Shinn has yet 2 be cleasned like kira, and when he realises that he will knw how hard it is to fight without killing. But ill have to comment about shinn beating kira anyday. NOT GONA HAPPEN ! kira's purpose is far stronger then that of shinn's! becoz he carriers the weight and fate of the world on his shoulders as well as his loved ones.