A distribution is just if it arises from another just distribution by legitimate means. - Robert Nozick

If someone picks up a third party and throws him at you down at the bottom of a deep well...may you use your ray gun to disintegrate the falling body before it crushes and kills you?

Once a person exists, not everything compatible with his overall existence being a net plus can be done, even by those who created him. An existing person has claims, even against those whose purpose in creating him was to violate those claims.

Utopia is a meta-utopia: the environment in which Utopian experiments may be tried out; the environment in which people are free to do their own thing; the environment which must, to a great extent, be realized first if more particular Utopian visions are to be realized stably.