The argument isn't "everyone else is worse, we shouldn't blame Apple", it's "Apple is actively and measurably better than everyone else, and has been shown to actively be working on improving things, why the **** aren't we holding everyone else's feet to the fire?"
Foxconn employees make in the neighborhood of $2/hour. That wage is, in the areas of China from which these employees originate, sufficient to *buy a house* back in their home town from just couple years worth of work, in part because they have virtually no living expenses while they're working in the factory. They get room & board, medical, etc. Yes, by our standards, conditions are cramped, but if they want to, they are perfectly free to rent a place off campus, and with their pay they can actually *afford* to do so.
You can't directly compare pay rates without also factoring in living expenses and cost of living. In the US, minimum wage puts you solidly in poverty. Over there, $2/hour is a pretty good wage, equivalent to roughly $10-15/hour over here. That's not a bad wage for unskilled labor. (As a matter fact, that's about what we pay people for unskilled factory work over here.)