The Pope wanted it gone. This is the most Catholic Supreme Court in US history and they got rid of abortion. It really doesn’t get any deeper than that.
Roberts in particular is really showing his age and is devout. It’s highly likely they threatened to withhold communion from him just like they did with Biden unless he gave in. If you really thought hell was real and you could end up going there you would be willing to do anything to avoid that fate. Including murder.
Put yourself in his perspective for a moment. He kills say a million women because they are denied lifesaving treatments. Well all those women are probably going to go to heaven anyhow, and heaven is forever. If he saves those women from death he goes to hell, the women he saved still end up going where they are going but he personally gets a time period in hell that laughs at a billion eons.
Wouldn’t you do the same? Would you really allow yourself to be tortured for fucking forever just to save people who are already saved? It makes no sense too. You might be the kinda person who would run into traffic to push a kid out of a way of a bus possibly killing yourself, but even if you were you wouldn’t just run into random traffic.