The “ Lesson” is do not support a war against the one who gives you cheap energy and the cheapest commodities that kept your country alive.
The second “ Lesson”, don’t blow up the pipeline that supplies your own cheap energy.
Germany has plenty of coal deposits. Hating on coal meant hating on energy independence. (On that note, switching to more EV's might make sense for them, but only if they kept using dependable coal for power.)
IMHO, the only thing solar brings to the table is if we use it decentralized to make our individual homes more energy self-reliant. Those of us with a healthy distrust of government and their overregulation of energy can be forgiven for using solar to reduce some of the control the government's warmageddon cult policies have on my family and our budget. That's why I have lots of solar.