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The vast majority of people don't want to break the law. If that were not true, society could not function. There could never be enough police to keep order if every citizen was willing to break the law. Most people police themselves.
When an activity is legal, society has placed its stamp of approval on that activity. There are a great number of people (perhaps a majority) who believe that if an act is legal it can't really be immoral.
When an activity is illegal, society official disapproves of that activity. There is a stigma attached to the activity because of societal disapproval. Many people will avoid the activity to avoid the stigma.
So if abortion was illegal, there would be fewer abortions, because the law itself (even with minimal punishment) would be enough to deter a great number of people from having an abortion.
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