All rational people can agree that killing your 18 year old son is murder. Not all rational people agree as to when life begins. I'm not sure what "It's back by science" means, but your opinion of when life begins is not a fact. It is an opinion. You can not use the government to enforce your opinion of when life begins. It's still inside the woman. Your point about killing your 18 year old son is completely irrational. Is your 18 year old son still living in your wife's womb?
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