Another point is that germany is decentralised whereas france is centralised. France can formulate a policy and stick to it, but in germany usually every level of government is involved. And nobody wants to have a nuclear power plants near you. Ignoring local decisions for the greater good is very hard in germany. So I think a there's also naturally a greater pushback in germany than france and then came Chernobyl, which (if I remember correclty) affected germany way more than france. You can still find traces if you analyse wild deer shot from certain areas.

You can also see this in the rail networks, if you ignore that france invested more into it's rail there's also a different philosophy. France not only connected major population centres, it is also quite focused on paris. Exactly as some planners, sitting in paris and planning top-down would devise them. Germany tries to interconnect as much as possible, benefitting as many as possible.