I think Peter was murdered because of what he found out about the company.
“What if the mosquitos are converting the pesticide to a weak form of pyrethrums, a poison to people?”
“If you agree to work for us, half the time you won't know the purpose of your duties . . . and when we do explain, we might not be telling the truth. But that's the real world, folks . . .”
“There's no way out," he announced with satisfaction, "and no amount of wishful dreaming will produce one. The demon won't go back in its bottle, the face-off is for ever, the embrace gets tighter a...”
“This is a war," Lemas replied. "It's graphic and unpleasant because it's fought on a tiny scale, at close range; fought with a wastage of innocent life sometimes, I admit. But it's nothing, nothing...”
“Theres no way you can kill someone and get to the other side of the experience unchanged.”
“Why do we electrocute men for murdering an individual and then pin a purple heart on them for mass slaughter of someone arbitrarily labeled enemy?”
“He had also learned that there is no use murdering people; there are always so many left, and if you tried to murder them all you would never get anything else done.”