Julie Plec on Caroline: "a neurotic, jealous busybody who is always putting her foot in her mouth and Damon isn’t going to put up with her, so she’s doomed. She is absolutely, fundamentally doomed by definition of her own personality." So Caroline's doomed as a teenager for being a teenager, but Damon gets to spend 150 years raping, murdering, manipulating, and abusing people for his own pleasure and entertainment, and he gets to be cast as the moral arbiter. (Like all his punishing Elena this season for Katherine not loving him.) And they basically push Caroline into being whatever they want to further the story, usually having her be used/misused in the process.

The series tends to acknowledge Damon's actions for an episode or two and then handwave them and focus on how he's Angsty and Hot and Funny. And they've already rewritten it from his using the safety of Emily's family to make her save the tomb vampires to her doing it and not telling him until he was a vampire, which is something that makes no sense whatsoever, and they're doing a pretty good job of trying to say that everything bad he's ever done is all the evil woman's fault. IMO, the writers have been pretty weak (and frequently misogynistic) when it comes to Damon's character and holding his acountable, because by the time he murdered his best friend, the only reason not to kill him has been that he's a main character. Not killing him basically makes all the other characters look stupid.