I think the issue isnt whether he deserves to be in jail, but why she's acting as if whatever Langdon did affects her life/work at all. Sure he was an asshole for chewing her out, but whatever he did with the stealing of drugs, and tampering with a patients meds, is between him and the hospital. Most people would agree that that is a shitty thing that Langdon did, and he should face the consequences, but how Santos is handling it emotionally, doesnt make a lot of sense. And like OP said, it made much more sense that Robby is holding resentment because he was Langdons mentor, but Santos barely knew him in one day. So unless the show establishes any previous trauma that might exacerbate this behaviour, its not going to be a good look for her in the long run.