> If humanity was sane and rational

That is exactly my point. If humanity was sane and rational I wouldn't be concerned about nuclear energy, because I would trust organizations to deal with it. But I do not trust organizations to handle this. In countries with vast space radioactive waste management might be negligible, but in Europe contamination affects more people immediately.

> Climate change activists opposing nuclear energy is like firefighters opposing water.

No, it's more like firefighters opposing AFFF. https://www.drugwatch.com/news/2021/02/22/firefighters-file-...