It's not so much a mistake as the Cult of Capitalism's Counter-Reformation.

It's not even about money really. It's about recentralising power so that the peasants don't have access to it, and so can be exploited ad lib.

Most 'reforms' are about consolidating that power base. Wind is considered a threat because it has the potential to be massively decentralised, with players at every level from house-sized microgeneration to huge national farms.

Nuclear is inherently centralised and anti-democratic because it can never be fragmented like this. In the minds of the noobies who are promoting it, that's a good feature and not a bad one.

Also, Big Technology is always more exciting to plan, finance and build than relatively small-scale run of the (wind)mill projects. Where's the fun in building something that you know will work reliably and can be put together fairly quickly? Isn't it much more interesting to have lots of meetings with government representatives and law makers who make you feel like someone really important, and will hand over big sexy cheques more or less on demand?