Just as cultural norms and values differ from one society to another so do laws, and a country’s legal system should, and inevitably will, always reflect the beliefs and moral values of the people they represent unless the society has descended into totalitarianism. It is difficult to decide what should be applicable universally for this reason, many countries wherein the majority of people are religious view abortion as morally wrong and abortion is often illegal in such states. Who is to say these people are wrong in their own country? If a society value their religious doctrine above all else to enforce a world law that contradicts this would be disastrous, and akin to advocating legal tyranny.
Most countries in the world are now democratic so some degree, and in such democracies it is only right for the laws of the land to reflect the people just as elections will, either directly or through a representative, help shape the governing of the country. To argue the opposite of that most people consider to be ethical will only be met with hostility and argument and would inevitably be voted down or voted out in a democratic system. Exporting a ethical mindset is not an easy task and could be viewed as obnoxious and overbearing to people that have the opposite view.
Some international regulatory bodies do exist however such as the International Criminal Court and the International Court of Justice, whose purpose it to preside over matters of international law. However many nations have stated for numerous reasons that they do not recognize such courts, with even many powerful states not recognizing some widely accepted international laws. Abortion cannot be made legal everywhere as it would be unworkable in the current international legal system, if abortions were to become an internationally recognized law cultures that didn’t recognize the ethical nature of abortion would simply not ratify the law and not be legally obliged to follow it.
Just as it is difficult to impose bans on certain weapons worldwide, it would be impossible to impose such a law as this, and we should not waste time in proposing such changes. Education and dialogue on the ethical nature of abortion would be a much more reasonable and effective way to approach the legal question of abortion, if a majority can understand that abortion is something that will inevitably happen regardless of the law and it be safer and fairer to allow everyone access to abortions laws could be accepted. In this way education should be the main mission of abortion advocates, and likewise democracy should be advocated too, as many democratic countries are in decline meaning that most states tend to be or are becoming more autocratic. These countries may not even reflect the beliefs of the people of that country but may be imposing individual beliefs, thus making these regions less susceptible to adhering to any kind of law, international or otherwise.
Why should law reflect social morals
Laws may be ineffective if they don't reflect social norms
How many democratic countries are there in the world?