Because the electorate isn't who they serve. It's a case of convincing the electorate this is good for them rather than acting on the concerns of the general population.
Caught a bit of the end of it last night, Patterson is a proper awful old tory, the sort you thought was dying out and being replaced by shiny marketing people. His comment about 90,000 wind turbines being needed to replace nuclear, and saying 'where would we put them all'? It's less than 1 per square mile across the country, you thick twat (not even allowing for all those they can stick offshore).