Never say never, as the cliche goes. The example you give is an extreme that's difficult to argue with. And yet I find it difficult to agree with you. Hey, I can go so far as giving another example - Chris Barnard was accused of butchering and killing many a guinea pig before he pulled off a successful heart transplant. And yet I'd dislike myself a little more than I'm comfortable with if I applied "never" to truly random acts of kindness.