Blowing up the Nord Stream pipeline was an act of war. As long as we can plausibly deny having blown it up, we may forestall a reprisal. Besides not knowing who did it, I also wonder who this blast was aimed at. You might say it was aimed at the Russians and was designed to cut off the supply of money that Germany was paying for the natural gas being pumped through this pipeline. But the Russia shut off the supply of gas to these pipelines some time ago, so there's no gas flowing west and likewise no money going east. Now it will make a difference in the future if Russia and Germany ever normalize relations again, but without the pipeline Germany has less reason to do this. Right now it's a hammer blow against Germany and the European Union.
We may not have any proof of who blew it up, but the most belligerent and capable actor is the USA. The standard method of criminal investigation is to identify who had the means, the motive and the opportunity, and all three of those point to the USA.
All of which makes me wonder who is in charge here. There's been a lot of blather in the blog-o-sphere that President Joe Biden mental faculties are in serious decline. Some of the stories are rather persuasive. If those stories are true, then someone else must be running the show. Who would that be? The White House chief of staff, Ron Klain? He's leaving after the elections next month. The Secretary of Defense, Lloyd Austin? He denies that we blew up the Nord Stream pipeline. Or do we have a rogue faction operating under cover? The same rogue faction that panicked Pelosi into calling out the National Guard back in early 2021 (and I don't mean Trump and the 'insurrectionists')?
Or maybe Biden hasn't lost his marbles, he just doesn't care what the press or the public thinks anymore. After all he's the Imperial President of the Empire of America, nobody can touch him.