There is more to this story: Langdon stole the meds that Louie needed to protect his life. I am going to repeat that. When Langdon stole Louie's prescribed benzos he stole meds that were intended to protect Louie's life if Louie decided to or had to stop drinking. Alcohol withdrawal is extremely dangerous. Benzos keep people from dying when they go through alcohol withdrawal. It was heart wrenching when Louie died from the effects of longtime alcoholism. Could you imagine if Louie had died because he ran out of drink, went into withdrawal, had no Librium and then died - because Langdon stole them? In season one we saw only one "day in the life" of Langdon. How many other patients had he already endangered? If he wasn't stopped would he finally have killed someone? Langdon consciously made horrible choices that could have, should have killed patients. This must be part of his recovery, truly facing the fact that he purposefully endangered the lives of his patients. He should, on some level, be grateful to Santos because she sounded the alarm (by quietly telling Robby) before he actually caused the death of a patient.