Her crying for Maria is a writing quirk and how would you have her react? Should she walk around poppin bottles and happy she killed a woman she could never prove as crooked for trying to take down her serial killer and deranged brother?
As for the police force? shyt..Dexter has a made a COMPLETE fool out of Angel, Deb, Matthews, La Guerta, Matsuka...every damn body. He's been on his Batman steez from the beginning. He's had their top cases figured out in two episodes at best....shyt, he figured out who killed Mike in one episode and Angel got duped and played like a sucker by a manipulation by Issac. Just the way it goes. Well..except for Doakes. He figured Dex out in record time and caught him. Lila was just ahead of the game