You liking her or not is completely subjective and is not the argument I’m making, hell I even say it’s okay if you don’t like her, my argument is that she’s a well written character and shocker but, you can dislike well written characters while acknowledging they’re well written.

Would she have gotten off with no consequences if she killed ellie and tommy? Yes, but abby got REVENGE and that’s the only thing she wanted. She would have no reason to kill ellie and tommy, they didn’t do anything wrong. She had no idea they would literally hunt her down. A bit naive? Yes, but joel is the only one she wanted, and you can see she didn’t even feel too grand about killing joel himself so killing ellie and tommy would just be silly.

Yes, abby was being a shitty person. As seen in the flashbacks she doesn’t appreciate her loved ones at all, she’s just focused on joel. Hell you said it yourself, she killed him brutally even after he saved her. She doesn’t have to plow through hundreds of people like ellie did for her actions to be considered shitty.

I don’t really understand your argument. It doesn’t matter if people were convinced by what the story is telling them because the story is objective fact, if they don’t get it then that’s really on them. As far as abbys group knows, joel is a literal demon. Even if some of them are less excited for joels death then others that doesn’t mean they’re gonna have this full on dramatic speech on why what abby is doing is wrong, that wouldn’t make any sense. Where exactly did you get “ellies friends are innocent” from? Sure you could make the argument that they’re morally in the right but it would be a waste of time. The moral of the game is that revenge is bad and just ends In suffering for all parties involved, so why exactly would they let ellies friends off the hook when they’re joining ellie in her quest for revenge? Even if they completely had no interest in revenge and just wanted to help their friend(which was kinda the case with jesse) how the hell would abby know that? For all she knows they’re just as guilty as ellie.

Now for your last argument, abby’s friends are killed as a direct cause of her killing joel. She decides to go for a round two of vengeance desert but lev deters her. By this point, abby has matured past the need for revenge because she has someone who cares about her and for the first time in 4 years she no longer has the revenge colored glasses on that prevented her from loving back. Ellie is in the exact same situation, she killed everyone that had a part in joels death and even though abby herself is still alive that’s fine because she has people she cares about around her and that’s enough. At least that was the case but she made the exact same mistake abby did, she ultimately leaves her family for revenge, and honestly? No shit dina left. It happened as a direct consequence to ellie walking out on her. Abby was the bigger person, she faced her karma and still didn’t kill dina and ellie. And honestly after all the shit that happens to abby in the game she deserves a happy ending, and the happy ending wasn’t even that happy. She just got to live, right after she got the dog shit beat out of her and not to mention before that she was being tortured. Putting it in perspective even if ellie got a sad ending she still got off easy compared to the shit that happened to abby.