Imagine a boat has a hole in it, and is sinking. Some of the crew-members make a big deal about it, and run a campaign to plug the hole and bail the water out. In the end, it does not sink and the remaining crewmembers conclude that it was not a big deal and that the campaign was unnecessary. It is a survivor's bias.
Even a small hole, if left unplugged, will eventually sink a ship. Likewise, some types of systematic problems in a country (that are not self-solving or naturally limited) will eventually ruin it if not addressed directly.