Yeah I mean at best Dexter indirectly caused their deaths.  With Doakes, I can still see it as somewhat of a grey area. Doakes came after and confronted Dexter, putting his back against the wall. Dexter didnt want Doakes to die, wasnt planning on killing him or having him killed, but was put in a position where he had to defend himself and dealt with a huge moral dilemma trying to find a way out of it that didnt result in Doakes dying. It doesnt justify Dexters actions or Doakes death, but Id chalk this one up to collateral damage and not an intentional death, Dexter tried to avoid it but other parties made it unavoidable. Laguerta on the other hand, is 100% Dexters fault. He wanted to kill her, fully intended on killing her, lured her out to danger, subdued her, etc. even though Deb ultimately did the deed, it all was possible because Dexter directly orchestrated the killing of Laguerta with the full intention of doing it himself. Batista has every right to blame Dexter for his ex-wifes death.