Who Made Mankind the Arbitrator of Truth?

Who made mankind the arbitrator of truth? No one, God isn’t silent on
the subject. He says, all men are liars, when did that change?
Rom. 3:13 “Their throat is an open tomb. With their tongues they have used deceit.”{Psalm 5:9} “The poison of vipers is under their lips;”{Psalm 140:3} 3:14 “Whose mouth is full of cursing and bitterness.”{Psalm 10:7}
If we are in a state of being shocked about all the deliberate lying
happening, may be the message is we can’t handle the truth!