We don't know if this is a majority opinion. It may be a minority opinion in the hopes of becoming a majority opinion. It may not even be real (although that seems unlikely). It could've been leaked by someone on the right to drum up on support but my guess is it's more likely to be someone liberal-leaning who leaked such a bombshell opinion as a massive regression for bodily autonomy and social rights.
If so, that person is a hero. Straight up. Just like then Bradley now Chelsea Manning leaking Benghazi video was (and is) a hero.
People have consciences whether you agree with them or not. Even in wartime and with unprecedented security measures the Manhattan Project was leaked to the Soviets basically immediately by people who saw the US having a monopoly on atomic weapons as being bad for the world.
It's also why I basically don't believe pretty much every conspiracy theory out there, particularly if it involves a lot of people (eg faked Moon landings). Governments are terrible at keeping secrets simply because they're made up of people and those people have motivations of their own.
The Supreme Court is and always has been a political institution. All of the talk about constitutionality is just moralizing and window dressing in expressing a political view as law. This is the same Supreme court that ruled that "citizens" did not include people of African descent [1]. This is the same Supreme Court that in the Reconstruction / Redeemer era completely undermined rights of former slaves.
If you concentrate on the leaker here you're missing the big picture. You're falling into right-wing propaganda about the sanctity of the Supreme Court. It's a myth and a lie.
[1]: https://fivethirtyeight.com/features/what-americans-really-t...