The police force confessions all the time. It makes their job easier of they can close a case. It's one of many problems with our system. It doesn't matter if someone is actually guilty.
The central park five is a story of five innocent men who were later exonerated. He confessed, they confessed not because they did it but because the police needed a confession. By them confessing Matias Reyes the actual rapist was free for another four months and was able to rape at least one more woman. And he also killed one of the women he raped so yeah it fits his MO, his and only his DNA was found. Matias Reyes raped her, alone.
Kirk is scum.