This is still taking the OP at face value. If we're being honest, the destruction of the pipeline doesn't really make geopolitical sense for either the US or Russia, given the information we have. If we must assume that one of them did it, then in the absence of evidence we should prefer to assume that it was the action of an irrational actor, and Putin is clearly the more irrational of the two here (as evidence, allow me to gesture towards the war in Ukraine).