If it would, in reality and not as a bit of banter meant to imply that the insensitivity and expectations of others weighs heavily on your happiness(Thus being evil freeing you from the weight of the world, the pressures of do-goodery, etc, etc.), prevent you from threatening to, or actually succeeding in, rending random parts from people's bodies? Certainly.
A little crankiness in the morning is well worth the prospect of Xander having both arms. Especially since without one, we would be subject to hearing about his woes surrounding learning to play video games with only one hand.