france isn't us, but we've seen how dangerous it is, instead of hoping to not get in this situation ever, why not engrave this in constitution so that changing it again would be extremely hard?

Abortion was sensitive in France when it was voted in the early 70ies.

Few people in France oppose abortion laws as they are today, but the abortion restrictions are quite different compared to the US. E.g. abortion time limit in France are much shorter in "usual" cases, ~3.5 months. It was 3 month until quite recently, and that extension was controversial.

[edit] controversial, but nowhere near as controversial as abortion is in the US. I wonder how controversial extension to 2nd or 3rd trimester would be in France. Those later-terms are legal only under exceptions in France (rape, danger to the mother, etc.).

To badly quote Simone de Beauvoir: "One political, religious or economic crisis will be enough to challenge women's rights, our rights. Throughout your life, you must remain vigilant". GP is right that things seem unthinkable do not stay unthinkable for eternity.

Abortion was illegal in France until 1975. It was legalized by the legislature, and the challenge to the law went up to the Court of Cassation, which upheld the law ruling that the government can properly regulate abortion (which includes permitting it up to 12 weeks, as the 1975 law did).

Two years earlier, the US Supreme Court had struck down any state regulation of abortion prior to viability (around 22-24) weeks. Effectively, it imposed an abortion regime far broader than France’s by judicial fiat.

France is more and more influenced by US politics and cultural struggles even if they rarely translate to the French situation