If I could twist that a little and disagree with your sentiment, society doesn't really function that much better because of rules, or at least, rules are far from imperative in allowing society to function. Rules are overly simplistic prescriptive attempts at regulating behaviour; more holistic and penetrating action is generally required. Basically, the importance of rules/laws of themselves can easily be overstated.
There're rules against littering, murder, speeding, polluting, acting the WUM, and so on. Do the rules eradicate the problems? Or more pointedly, if the rules didn't exist would the problems be much worse?
Societal and personal values, not the simple existence of rules, determine one's behaviour. Thus, would the mere removal of a ban on something as personal and emotive as abortion really change peoples' attitudes to the extent that society could no longer function, as you fear? Do people decide not have an abortion because it is illegal, or is it because of their personal belief system?
Balance: the improbability of the ban's removal leading to a worrying escalation in abortions in Ireland; increasingly liberal, individualistic mindsets amongst the young suggesting the law is out of line with those affected by it; continued increase in teenage sex; the availability of abortion abroad; the lack of personalised local after-care for those who opt for abortion; the broader quality of life issues for the many returning women owing to a stigma on abortion - removing the ban can influence paradigms here; a more open attitude to abortion and the correlative increase in advice available before and after can help women make the right decision for them to help them through the process; and so I think one might reasonably conclude that abortion's illegality in Ireland seems antiquated, unnecessary, and simply wrong.
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