I think every child goes through a stage in which they develop a keen sense of injustice. More specifically, they become keenly attuned to the slightest lapse in what they see as equality. This stage is marked by frequent, incensed outbursts centering around three little words: “it’s not fair!”
In my experience upbringing has little effect. Even a child who has been taught about life’s essential unfairness since birth by jaded, disallusioned parents will launch into full-on ACLU dignified-outrage mode when his sister is given a 50.03% share of the french fries. Somewhere between the “cause and effect” stage and the “maybe kissing isn’t icky after all” stage, kids’ minds just naturally develop a finely honed sense of fairness, followed immediately by the capacity for wounded dignity.
John McCain, I think, never grew out of that stage.
I pity the other parents at the kindergarten he sent his kids to. He was probably the kind of parent who would insist on forming a blue-ribbon panel to resolve playground squabbles in the most equitable possible fashion.