Also we read the warning as "don't buy from them, rather buy from us".
And it was extensivly debated in general.
The EU kept at it with plans to expand until the war started for the second time and “someone” took it upon themselves to violently sever that link.
Now at latest by 2014 that should have changed indeed. But even then different approaches would have been possible then cutting all ties and hope this will work out better.
I'm no fan of Donald Trump but this was one of his rare Ws. At a NATO summit in 2018, he warned Europe about the dangers of dependency on Russian energy and basically bullied Germany into building an LNG plant, something that was critical to Europe after Russia invaded Ukraine 4 years later [1].
Biden as Vice President to Obama warned Europe of the same thing in 2016 [2] regarding Nord Stream 2.
So American administrations have consistently and repeatedly warned Europe about the dangers over 6+ years. So how can anyone argue that "[Russia would] never start a war in Europe" when the US said basically that?
[2]: https://www.dw.com/en/biden-warns-europe-against-dependency-...