Seeing things as more important because they are recent.
New knowledge is both a blessing and a curse. It is a blessing when you compare medieval to contemporary findings in medicine, ethics, physics. It is also a curse because it seems our minds are made to select for new information even at a steep cost of its quality.
Tyler Cowen calls it recency bias. “In politics and economics, too many predictions give disproportionate weight to the events of the recent past.” Link