I think the point many people are making is that "I will be replaced by someone willing to do this morally reprehensible job" is not an excuse for doing the job yourself, as that 1) increases the pool of people who are willing to do the job and allows more bad things to happen and 2) as people are not purely replaceable, it isn't clear that the Board of Apple will be in a good place to find someone as competent at supply chains as Tim Cook to replace him... particularly someone who is both competent and willing to play with China.