we should first describe, how democratics should be, and how politicians should be. It`s not very nice to give poor people the debt of the wrong selection. We can`t demand that the people are on a high intellectual level.
It depends upon what basis the individuals that do vote are chosen. In order for such a selection to be valid, individuals must be chosen upon the basis of understanding the issue and having an insight. All attempts to properly filter would result in a biased selection by the selector.
If more people admitted that they do not posses the understanding of relevant issues required to make an informed choice in an election (what-ever that may be), and thus abstained from voting, governments would be less corrupt, more representative and effective. Voting for the sake of it is not good
If voters are self-selecting, the Dunning-Kruger effect indicates that those with the least knowledge will consistently overestimate themselves and vote, while those with the most knowledge consistently underestimate themselves and might abstain.