If you can prevent something bad from happening at the cost of something less bad, you ought to do it.
The second principle, as quoted above, is the link between the seemingly obvious claim that: starvation and death are morally bad, which forms the first principle in Singer's famous paper "Famine, Affluence and Morality" published in the year 1972, and the apparent obligation of the affluent to donate money and other material objects to alleviate the suffering of anyone regardless of emotional and geographical proximity.
I attempt to make a refutation of this logical calculus, separate it out from its purely isolated framework and look at the extended implications such a logical deduction can further entail. John Arthur in his paper: "World Hunger and Moral Obligation: A Case Against Singer", makes some good points in this regard. My take on this is greatly informed by his arguments and I think I am obliged to give him due credit. I shall also pay my gratitude to the arguments of Dr. Kwame Anthony Appiah (New York University), whose work "Cosmopolitanism" contained some convincing vantage points on this subject.
I shall try to keep this brief in view of the fact that this is merely a post and also because length is seemingly negatively correlated to the number of views a post gets. My refutation of Singer's argument is based on the logical inconsistency that his second principle potentially has with some of our firm principles: namely those of consent and liberty.
(2) If it is in our power to prevent something bad from happening without sacrificing anything of equal moral significance, we ought, morally, to prevent it.
This claim appears to have some unpleasant consequences which I shall elaborate as follows:
Let's say Lisa is a college student aged 19. Professor Gnomes is her professor. The person of Gnomes, though apparently very pleasant in his behaviour, possesses a predatory mindset and has his eyes on Lisa, in desire of sexual intercourse. Gnomes, aged 76, is suffering from a terminal disease and in his recent visit has been informed by his doctor that he has less than 6 months to live. Gnomes makes a request to Lisa for sexual intercourse with him as his last wish. Lisa, who is an avid reader of contemporary philosophy while initially disgusted at such a proposal, is struck with a moral dilemma while she is on the verge of tearing the letter.
Of course, her momentary physical and psychological discomfort is not as important as the last wish of a dying man. If one agrees with the Singer principle, one must, in order to be logically consistent, urge her not to tear the letter and give the consent. But such an insistence would appear to be horribly disgusting to even the worst of us. How does then the Utilitarian dispense with such flagrant moral stakes that arise from the second principle?
Nota bene: I am just a 17 year old high school student from India, so I ask for apology for any mistake that I have made in my analysis and also for any language errors that went unnoticed.