1. what Faith did was a lot worse than what Spike did IMO.
Far worse than Spike's attempted rape, yes, agreed. Far worse than killing hundreds of people? Really?
2. At some point, when you can't apologize for something you've done because it's so bad... Actually doing it and apologizing becomes rude and condescending ... Buffy's comment wasn't uncalled for ... Faith should have known an apology was out of the question. If you can't apologize for something because it's so big, you shouldn't because you'll sound like an ass.
Again, agree with you about Buffy's comment not being uncalled for, if, and it's a big if, the reason she gave it was the reason you state here. List what Faith has done to her and no apology can make up for it, you're right. However I think the reason you give for why Buffy says this is not the real reason. It's just the surface. Look deeper at the subtext and what her motivation is.
Faith should have known an apology was out of the question. If you can't apologize for something because it's so big, you shouldn't because you'll sound like an ass.
What episode did you watch? (just teasing.)
Faith tells Buffy, "I can't ever make it right." She knows there is no forgiveness for what she did.
Sure, she stayed in prison... big whoop. Now every criminal who stays in prison should automatically be forgiven of their crimes?
There is quite a difference between Faith and every criminal. Every criminal in jail is there against their will and can't do a thing about it. Faith, if she wanted and as she proved, could have escaped at any time. Slayer, remember? The whole point is that she chose to remain and take her punishment. To endure all the suffering being in prison brings.
I'm sorry, Faith hadn't earned Buffy trust back yet. Faith hadn't earned forgiveness. Not even close.
You're quite right: she hadn't earned Buffy's trust yet.
As for earning forgiveness, well, like you said, there is no forgiving what she did. However, while it should never be forgiven what she's done, there does come a point where you have to get past it and move on. Just like, to repeat a point, the Scoobies got past the fact that Angel murdered Jenny, or that Willow flayed Warren alive. There's no forgiving those actions and when thought about they will still cause pain, but it is possible to accept the need to put those memories aside.
3. This is where my opinion gets... well, really opinionated. I don't think Faith did enough good to be forgiven.
You're a Spuffy fan, yes? Love Spike, yes? (Who doesn't love that character?) If you analyse your feelings can you honestly say you're being objective and fair to Faith? Do you judge Spike by the same standard?
I think that because Spike is so awesome, so likeable and easy to love, he gets different treatment. He's witty, sarcastic, intelligent, devilish, handsome and on and on. Because of all this people tend to choose to ignore his past and what he was. Call it a selective blind spot.
Faith is much harder to love because she is a victim of her own facade. The bravado and steel outlook she projects is a defence mechanism that is so firmly in place that few people penetrate the deception to see the scared, vulnerable and fragile woman beneath. Her "I don't care," mantra is very effective, but is actually more about trying to convince herself than other people, although it works on others and doesn't work on herself. It's the definition of the literary phrase "tragic irony."
Faith is definitely the victim of physical abuse as a child "“ "My dead mother hits harder..." - and she's also almost certainly the victim of sexual abuse, too. Just look at how she freaks out with her "Don't touch me!" scene. She's poorly educated "“ "It does a heel thing too?" "“ and comes from an impoverished background. She's one of life's victims and a very damaged soul. All of this, and much more, makes Faith very difficult to warm to, but if you see why she is like she is, you'll find you begin to care a great deal more about her.
So I believe that fans like Angel, Spike, Willow, Anya, Giles and so ignore or forgive their horrific crimes because their characters are charismatic and easy to like, whereas Faith takes much more insight and effort.