I would say that like many things in life, it's a tradeoff. There're costs and benefits to using these things. Talking about one side but not the other doesn't make sense.
Quick personal example - I lived through energy shortages as a kid in the Soviet Union. Situations where there was no heat in the winter and/or no fuel for cars and public transport.
From pure fossil fuel consumption standpoint, these were great times, as we weren't using any. From a quality and sustainability of human life, these were terrible times.
At the very least "burning fossil fuels is bad" is a statement of privilege. A person who's cold or unable to travel or get necessities delivered would never say this.
None of this is to say that we shouldn't move towards primarily nuclear in the long term - we should but we need to talk about this in a mature way.