Kindergartener was asking questions at the police station, but his next question is a riot

Matty's kindergarten class was on a field trip to their local police station where they saw pictures tacked to a bulletin board of the 10 most wanted criminals.

"Is this really a wanted person?" Matty asked, pointing at a picture.

"Yes," answered the policeman. "The detectives want very badly to capture him."

Then Matty said, "Well then, why didn't you keep him when you took his picture?"