The human species initially developed skills at co-operation that have allowed it to become the dominant life-form on the planet. But this ability to cooperate began around only the smallest groupings. Cooperation was based on trust, which initially was primarily a matter shared genetics - literally, if you smelled like I did, I worked with you. The history of civilization has pretty much been one long struggle for mankind to learn to enlarge the circles of cooperation needed to accomplish ever greater quality of life for itself, vs the constant tendency to withdraw back into the clan or tribe or sect. The objective value of truth ultimately doesn't matter when it comes to tribal members from outside the tribe, and tribal members will never seek truth objectively as long as they are bound to the tribe. The only, but hard answer, is that when we create a society whose members begin to identify with the larger society around them. When they begin to accept the value of every other person, to see their destiny as tied to every other soul on the planet, then will they start to seek truth objectively instead of through their tribal filter.