Top-Down approach
According to the Top-Down approach, we start with a general normative theory (e.g.,
utilitarianism, deontologism, virtue theory…), and we apply the general principles to
particular situations(从宽泛理论出发,寻找实际适用点)
Problem:
Application: What and how to apply a general principle
Specification: Difficult to apply general principle without considering concrete conditions
Reliability: Different theories conflict with each other, or conflict with moral intuition and social norms
Circularity: Moral theoris receive confirmation from intuitions about specific situations
Bottom-Up approach
According to the Bottom-Up approach, we start with considering intuitive judgments, social agreements… about particular situations. We then compare to relevantly similar cases (comparative case analysis). Finally, we generalize to standards that cover all sufficiently similar situations. (在就具体事件形成了一定观点后,横向寻找比较示例,形成统一理论)
Problem:
Insufficiency: Particular cases can not determine the general theories
Conflicting intuitions: There are cases that we can’t reach an agreement in social moral intuitions
Risk of biases: can’t avoid biases in moral intuitions
Reflective Equilibrium (John Rawls) 反思平衡理论
1) start with the broadest possible set of moral judgements about a subject
2) build a set of principles that reflect such judgements
3) Search an equilibrium between general principles and particular judgements
Problem:
Coherence doesn’t guarantee justification
Vagueness of the method
JJ Thomson violinist case
The Violinist case: You wake up in the morning and find yourself back to back in bed with an unconscious famous violinist. The violinist has a fatal kidney problem, whose survival depends on his staying attached to your circulatory system.
The point of the case and argument: In this situation, it is uncontroversial that the violinist is a person and has a right to life. Yet, Thomson argues, he does not have a right to use your body
, and hence you have a right to unplug yourself. By analogy, we should also agree that a woman can terminate a pregnancy if she has been victim of rape (against her consent). As in the violinist case, the fetus’ right to life does not outweigh the woman’s right to control over her own body
. In conclusion: even if a fetus were a person, with all of the rights we would confer to any other person, it would still be permissible to abort under certain conditions
YES
A good argument from the point of view of theories such as NLT, but not very good from a consequentialist point of view(不同道德理论的冲突)
A feeling of repugnance is no good reason to think that a practice is morally wrong.
We are not merely the product of our genetic composition
NO
It is an act against nature.(反自然的)
By cloning and modifying humans’ DNA we risk to end up in a dystopian world. (反乌托邦)
Negative effects on the society.(考虑社会效益)
Nozick’s theory of justice(libertarianism 自由主义)
Just distribution means the distribution that reflects what people have legally earned.
The most important principle: protect the safety, health, and welfare of the public in the performance.
Principle:
An action A is obligatory iff A would produce a higher leverl of utility.
Well-known formulations of CI:
Act as is the maxim of your action were to become by your will a universal law of nature.
Morality is grounded in the respect for all the rationals autonomy.