The only way Putin has a remote chance of winning the war at this point is if western support stops, destroying the one mechanism that might actually do that seems counterproductive.
I'm not saying I believe this is the cause, mind you. I'm firmly undecided on that one.
If there was a greater interest at play Russia would be a very different place, and Ukraine would willingly join their sphere of influence.
Which is always to stay in power (and maximize their power).
So I agree as short-sighted and bad it would be for Russia to do this, if it helps Putin stay in power right now, it makes sense.
And honestly, who else would do it?
Q: "But how will you do that, exactly, since...the project is in Germany's control?"
Biden: "I promise you, we will be able to do that."
Add to that the Polish FM (husband of The Atlantic hack Anne Applebaum) thanking the US for destroying the pipeline on Twitter. Maybe you could try doing your own research-- outside of the security state stenographers like WaPo and Wikipedia.