Two things can be true.

Nuclear energy can be prohibitively expensive and impractical and have a massive storage problem. And fossil energy can still be even worse with externalities.

My 2 cents:

For the case of Germany, yeah it would be batshit crazy to build new nuclear reactors right now. Completely irrational. But turning off the existing ones prematurely was a grandiose idiot move and here we are still mining brown coal. People hold up the "but the nuclear plants that got shut down were replaced with renewables, not coal". Yeah, well those renewables were supposed to replace the coal.