No, because the bending force is resisted by the plate right next to it, so it becomes a shearing force.
Edit: Oh I think I see what you mean now... but how often do you see a pin snapped in half? It's a consideration in theory, but not in practice. In fact, in theory, surely the longer pins would be weaker, as the length of the lever is longer (the force being applied in the centre of the pin by the sprocket)?