It was more than 30%

> replaced with about the same amount of renewables.

That turns out not to be the case. You cannot compare electricity produced by intermittent/weather-dependent renewables with electricity produced by dispatchable sources. Different products.

So we replaced cheap, reliable, CO₂-free electricity with expensive, unreliably and also CO₂-free electricity. At a cost of € 400-600 billion.

Pretty bad.

> "the most catastrophic peacetime decision in human history"

That's actually pretty apt description. Since you think it is ridiculous, I am sure you will be able to trivially come up with a at least about ten that were worse. (If it's less than ten, it would still be in the top 10 of most catastrophic decisions).

Sabine Hossenfelder described it as "the dumbest thing the Germans ever did" in one of her videos.

(To the objection that there might be this other thing she replies that that was evil, not dumb)