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So much I don't like about the reasoning above. Abortions should be illegal because the person had a choice? I have a choice whether I eat a sandwich for lunch. Should it be illegal for me to abort eating the sandwich halfway through? Choice has nothing to do with it. Where did I say abortions should be illegal because the person had a choice. I didn't. I said that it may be seen as morally wrong by some people if the person had already committed to being pregnant. I don't think that abortions should be illegal if the person had a choice, I personally believe that the choice involved here is the abortion, not the conception, and that anyone who wants to get an abortion should be allowed to do so. (Well, up to a point, I think that there is a 'point' in development where the foetus becomes a human, but that isn't until later on, and isn't a point rather than a gradual transition throughout the later stages of pregnancy. I read a very interesting article by Richard Dawkins about humanities obsession with set points of definition once, I'll have to find it. I also remember my Critical Thinking teachers famous speech from a long time ago about how some peoples argument can be destroyed by the fact that their argument is effectively that )
Things that people are going to do anyway should be legal? People will murder anyway, should it be legal to murder? If you make murder legal some people may be more likely to commit murder as they will not feel that there is a need to stay within the law and not get arrested. Although as a psychological and sociological experiment making murder legal would be very interesting, as people may actually be more adverse to committing crimes as they will know that there is a good chance that if you do commit one someone may set out for revenge and murder you, free of any legal consequences.
Things that are dangerous in the black market should be legal because they'll be safer otherwise? Child pornography is safer if it's legal, should it be legal? No form of Child Pornography should be legal. I don't personally believe that any form of stronger pornography should be legal, although I don't find much wrong with having adult people dress in a way that may be considered sexy by someone with a stronger sex drive than mine, as long as it's not done in a misogynistic way.
I reject all of your reasons for your opinion on abortion. Abortion should be legal because human beings have rights for a reason - and fetuses don't satisfy that reason.