Even in a mature democracy, like in the USA, it is difficult for voters to determine who is acting in their interest due to the multiple layers of non-declared

Even in a mature democracy, like in the USA, it is difficult for voters to determine who is acting in their interest due to the multiple layers of non-declared interests that exist in each political party. Now imagine what happens in a poor country. Your supposition that the electorate is responsible for this is as true as assuming that a victim of theft is responsible for the robbery.