You see it all the time with wrongful convictions and people signing confessions to crimes they didn't commit. I often wonder in these cases, do the officers, does law enforcement in this case really care who did it? If you bring someone in and interrogate them for 12+ hours and eventually they give you the answer you want to hear, do they never stop and ask themselves if the reason the person gave that answer is simply to make whatever they were doing stop?
It seems like some of these investigations the point isn't to solve the crime, but to dot the I's and cross your T's. It seems like actual public safety is an afterthought as long as you "catch the criminal" on paper.