What is your answer?

The universalizability principle U says (roughly) "If it's all right for you do A, then it's all right for anyone else in similar circumstances to do A." Moral philosophers are in almost universal agreement regarding

    { 1 } - how this principle is to be justified.
    { 2 } - the usefulness of this principle.
    { 3 } - their acceptance of this principle.
    { 4 } - all of the above.

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1 is wrong. Please try again.

The universalizability principle U says (roughly) "If it's all right for you do A, then it's all right for anyone else in similar circumstances to do A." Moral philosophers are in almost universal agreement regarding

Some think it's an analytic truth (true by virtue of the meaning of "all right" and other deontic terms). Others think it's an empirical truth, based on naturalistic definitions of the ethical terms. Still others think it's a self-evident truth. And so on.

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2 is wrong. Please try again.

The universalizability principle U says (roughly) "If it's all right for you do A, then it's all right for anyone else in similar circumstances to do A." Moral philosophers are in almost universal agreement regarding

    { 1 } - how this principle is to be justified.
    { 2 } - the usefulness of this principle.
    { 3 } - their acceptance of this principle.
    { 4 } - all of the above.

Some think the principle is very useful in ethical reasoning. Others think it's trivial and useless.

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3 is correct!

The universalizability principle U says (roughly) "If it's all right for you do A, then it's all right for anyone else in similar circumstances to do A." Moral philosophers are in almost universal agreement regarding

    { 1 } - how this principle is to be justified.
    { 2 } - the usefulness of this principle.
    { 3 } - their acceptance of this principle.
    { 4 } - all of the above.

I once read all the discussions of U that I could find. I found 111 people accepting U, and no one explicitly rejecting it. (I didn't include people who reject formulations that I also reject.) This 111 to 0 consensus is impressive, since philosophers tend to disagree about everything.

U resembles the principles of logic: people agree on the principle and yet disagree on the theory behind it. This is the kind of agreement that I foresee formal ethical principles as having.

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4 is wrong. Please try again.

The universalizability principle U says (roughly) "If it's all right for you do A, then it's all right for anyone else in similar circumstances to do A." Moral philosophers are in almost universal agreement regarding

    { 1 } - how this principle is to be justified.
    { 2 } - the usefulness of this principle.
    { 3 } - their acceptance of this principle.
    { 4 } - all of the above.

Would that this were so!

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