The EU politicians may have expected to declare an unprecedented economic war on Russia while the latter dutifully continued to fulfill its gas contracts to the EU. Seems plausible given the geopolitical mastery the EU posesses.
But does anyone else actually believe that? The other contract party trying to destroy your economy is a pretty good reason to terminate a contract. Failing that Russia could keep inventing problems with turbines. Or sabotage the pipelines somewhere one can more easily repair them.
I do remember how several media organizations and politicians from the EU jumped at accusing Russia with zero proof. Once the media mania subsided several US newspaper reported that indeed there was no proof whatsoever and they had jumped to conclusions.
The later conspicuous silence from EU governments on a potential culprit, lack of evidence pointing at Russia and several statements from acting US politicians threatening NS and gloating over its demise plus a former Polish politician thanking the US certainly don’t do anything to clear the US from suspicion. Still, this remains all circumstantial evidence.
But not even this kind of circumstantial evidence exists pointing to Russia as culprit. Just far-fetched theories about them wanting to dodge contract penalties or doing it to show that they can. This is as credible as them doing it as an experiment to see what happens when you blow up a pipeline, really.