In the past, being able to discern truth from lies would be the difference between life and death for most individuals. Still today, there are professions and activities, where you will be killed or seriously injured if you don't understand the difference between truth and lies. That is in contrast to a lot of academia, politics, online message boards and other purely inter-personal stuff, where truth is what the majority or the most active group decides it is, because it doesn't matter so much.

Separating truth from lies is something every one of us as a human have to do, and that we can't outsource with complete confidence to anybody else. Credentials are one of the last factors that should be weighed when determining truth vs lies.