The cult of the "expert" in which governance is delegated to subject matter "experts" who can recommend all sorts of things that no government would ever be able to recommend themselves. And it is then implemented with "we're following the experts advice, surely you don't doubt the science". It's almost at the point where the "experts" represent a modern form of the clerisy, a religion you dare not critique least you be accused of heresy.,
Coupled with the hollowing out of political parties (most parties have only a fraction of the membership they would have had in the 1960's or earlier) so that the politician's elected have very little in common with their constituents and there is no counterbalance to prevent a small clique of those from the extreme left or right of the political spectrum taking control of even major parties (hence for example the Corbyn takeover of the British Labour party or the level of control exhibited by the evangelicals over the Republicans).