"Facial recognition software? So? Its not a new thing.... We just used to sit meat bags in front of screens before this. Ya know, to recognize people?"
People watching security cameras tend to spot people doing wrong things, like starting fights, pickpocketing, sexual assault, etc. and send police to the scene to deal with it.
Facial recognition software... records and stores faces.
So if a victim comes forward later, they can be shown a multitude of faces that match their verbal description, and get pressured into picking one, more or less at random.
Cops are happy either way, as they get to make an arrest.
So yes, for police, Facial recognition software is cheaper and easier.