Actually in a lot of problematic cases the elections were "rigged", in different severity stages of "rigged" of course. Gerrymandering, restricting voting so that some groups are excluded, electors, for-life politicians (lords), and so on. And of course the usual dirty manipulations in the worse countries.

I think if somehow true democratic voting was magically implemented world wide, then a lot of assholes would be voted out and quickly. Even in countries where people are electing sociopaths.