Ted Bundy's mom Louise refused to believe her son was a murderer despite all evidence to the contrary. Her son admitted that he was the culprit and only that made her come out of her denial.

In a lot of third world countries it is pretty common and even expected that the average Joe will vote for whomever appeals to their emotions. Every sin of the politician is forgotten and forgiven even if the said politician has a history of inciting murder or being corrupted etc.

There is a good chance that people who voted for their candidate made up their minds long before any kind of "fake news" hit their newsfeed.