If it makes my position clearer, consider an analogous situation where your friend has a pet frog, but falls on hard financial times and is unable to continue feeding the frog. He looks around for someone to adopt a frog, but since there is an abundance of unwanted frogs in the world, he cannot find anyone to adopt the frog. So he asks you to kill the frog. Would you consider it morally wrong to kill the frog? If not, but you would consider it morally wrong to kill a human fetus in the same situation, then you are defending a position that makes an arbitrary distinction on the basis of species, which is no more justifiable than the sexist's arbitrary distinction on the basis of sex or the racist's justification on the basis of skin color.
john9blue wrote:i mean, if you really think that setting t = 3 months is okay, but setting t = 6 months is not okay, then i have nothing else to say. i get the feeling that you're just saying that to ruin the thought experiment, though...
I am saying that, except for the specific numbers you chose. I think a reasonable dividing line would be about one month after a child is born, based on arguments I have read. That is definitely early enough to be sure that the infant has none of the important characteristics that make it a person. It's hard to choose a good line, but that's no defense for choosing a bad line.