Don Marquis has the best argument for why abortion is immoral. He says that if you believe it is wrong to kill a normal adult human being then you should also believe it is wrong to abort a human fetus. It goes like this:
First premises:
- One reason it is wrong to kill a normal adult human being (NAHB) because killing them harms them.
- Killing a NAHB harms them because it deprives them of a valuable, human future (VHF).
- Therefore, killing a NAHB is wrong because it deprives them of a VHF. (Among other reasons).
This moral principle is also true in cases of abortion:
- Killing a fetus deprives it of a VHF.
If anything, it may be a successful rebuttal to arguments that rest on the premises mentioned.It's about a successful a philosophical argument as I've seen (I hold a degree in philosophy, I've seen a few arguments).
It´s not an argument against abortion.
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