What many people dislike about government in the US and in the EU is that the unelected bureaucrats tend make hiring and promotion decisions based on ideology with the result that each generation of career bureaucrats is more ideologically homogeneous and more extreme in its commitment to whichever ideology is best at spreading, which in the US and EU over the last 95 years has been Leftism.
Elections are a powerful check on this process because there isn't a similar mechanism at work in the general population of voters (or at least the mechanism is much weaker in its effects).
Also we can start to see why actors who oppose Leftism or who oppose ideological hegemonies in general sometimes want decisions to be made out of self-interest: even most zealous ideologues are more motivated by self-interest than they are by advancing ideologies. I.e., allowing decision makers to act out of self-interest is one tool in the toolbox for opposing ideological hegemony.