I think the foil of the brothers' motivations can be simplified like this:
Ender is always doing the wrong thing for the right reasons:
Ender always wants to do no harm, but is often forced to harm/destroy by situations beyond his control. He does his best to do things in the most moral way, and for only the most moral purposes, but that's not always as possible as he would like.
Peter does the right thing for the wrong reasons:
Peter simply wants to do whatever is the easiest/most beneficial for himself, and is in... Read more→
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Some theories: Can Peter, Ender, and Valentine represent the id, the ego, and the superego? Seems likely to me. Also, what is the significance of all the names in the novel? Note that Peter, Andrew, and Valentine are saints. What did they do? I guess Valentine is something love-related, and Peter is the bad apostle, right? Also, who were Locke and Demosthenes historically? I know that John Locke was an English philosopher in the 1600s, and Demosthenes was a Greek philosopher, right? And Eros, the name of the planet - what's the significance ... Read more→
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The teachers doesn't show any compassion to the pupils of the battle school. Althought we (me and my ego's) think that they have more compassion and care alot more of the children than they show through. We think that it is to make strong soldiers and that they don't want them to be weak and want to go home etc.