You're not wrong but also no one can magic up energy out of nowhere...
I appreciate that major infrastructure projects take a long time to build - but a gas-heavy Russia-dependent energy mix was the deliberate choice very recently.
That's like saying: "you can't blame the drug addict for choosing short term highs for a few years"
Another reason is instability in the Middle East and Iranian sanctions. Both also US choices that have shored up dependence on russian gas.
Right now, the quickest way to more gas would be a rapid deal with Iran that cuts right through US sanctions...
[0] https://www.nytimes.com/2022/09/05/world/europe/germany-exte...
[1] https://www.washingtonpost.com/world/2018/09/25/trump-accuse...