While I do agree we need to decarbonize asap and that renewable energy should make up for a lot of that, if not all, nuclear can help us out a lot with our ever increasing demand of energy moving forward. We should at least consider it, not explicitly state in the plan not to and be anti-nuclear. How far are we along to making fusion energy viable because I really don't know?
Regarding nuclear fission energy people often talk about reactor accidents. In my opinion (and that of many others) the far bigger and yet unsolved problem is nuclear waste. Uranium-235 has a half-life of over 700 million years. We have no way to store stuff for that amount of time. I have seen no sound solution to this yet.