Yeah, there is no real world way Deb isn't tied to Laguerta's murder. Fortunately, or unfortunately, however you want to view it, Dexter is not based on the real world.
Dexter KO'ing Estrada in broad daylight around children and everyone to see. Estrada not going to the cops is hilariously bad too. I'm forgiving though. I've stuck with this show since day 1 and I just have to deal with how ridiculous it can be.
@ Stacks, if it does play out like that and it probably will, obviously Dexter has to get his sister's back. He's gonna be killing a lot of "good guys" next season it seems if it goes that way.