I hate this kind of takes. Any rational person will have doubts facing incomplete information, and saying "no one doubted" makes them look like crazies. Nope, it's the way of logic in the absence of data.

I don't think anyone rational ruled out sabotage, or was confident that it was sabotage, though.

There are/were valid reasons to suspect it wasn't: https://thelawdogfiles.com/2022/09/nordstream.html