Getting rid of the old ones is quite difficult to do due to all the misinformation and public perception. A lot of that shaped by outdated information.
So instead of building new, safer power plants that will actually help us fight climate change, many places are still running old power plants as they can't afford to shut them down. There are still RMBK (Chernobyl-like) plants running today!
Mind you, Fukushima was not the only power plant that was subject to an earthquake and a tsunami. All others safely shutdown. Actually Fukushima shutdown too - and would have survived if not by the tsunami and some braindead decisions. Fukushima is like a Ford Model T that's thrown into a highway accident. It should have been replaced way before the accident.
Germany should be leading the effort here. Maybe they could take a page from France.