Why are innocent bystanders falsely identified in police lineups when the actual perpetrator of a witnessed crime is not in the lineup?

Why are innocent bystanders falsely identified in police lineups when the actual perpetrator
of a witnessed crime is not in the lineup?

Answer

The bystander and criminal were both seen at the witnessed crime.
Therefore mental “demons” for recognizing the criminal are activated by the sight of the bystander.
Seeing the bystander later activates memory, which causes people to think the bystander was the criminal.