I'm totally open to the possibility that someone in the West blew up Nord Stream. Any evidence that may exist is not in the public domain. For good reasons, because it might be embarrassing, might cause a diplomatic incident, or it could be a trigger for a wider war.

It's just that, on balance, and particularly taking into account past behaviours, access to the pipeline, and who would benefit the most from it, someone from Russia (not necessarily the Russian government) is by some distance the most likely candidate.