That you'll have to ask yourself. I don't see many people trying to steal nuclear weapons compared to, say, television sets despite the fact that nuclear weapons are much more valuable.
That's because the man at the pawn shop, when offered either, will say the same thing: "Twenty dollars."
Stealing within the human species however, is always done out of greed, laziness or for profit.
Really? Never hunger, eh? What about the laws in the Inca empire, that carried the death penalty for stealing? It had an additional clause, though: if the thief was stealing because his family was hungry, the "mayor" of his district was the one put to death.