@Count:
Why do you keep insisting that supporters of Big Mom not being the final arc anyagonist and making some sort of truce means we condone her actions? Of course we don't. Neither does Luffy. All of that has to change. But it doesn't mean that it has to occur woth Big Mom getting physically defeated and losing all of her power like every other arc antagonist. Her traits of negotiation, having a selfless dream, caring for racial harmony (and I know you're going to bring up the Giants and the library creatures, but we don't know about the former's circunstances and the latter definitely won't stand), respecting the selfish wishes of others, etc. These traits are highlighted not because they justify what she's done wrong, but leave open room for her being convinced to stop her depraved actions and have potential to be redeemed.
Your issue seems to be more about whether it's appropriate to forgive or tolerate Big Mom after she does change after getting defeated through non-physical means. And you can have that opinion. But please don't straw man what I and other users such as Greg are arguing for. Because saying that Big Mom and Luffy will be on positive terms at the end of the arc does not equate to being fine with letting her continue to pull these horrific stunts. She has the capability to learn her lesson, and it will most likely occur.
So Pekoms was betraying Big Mom. That is not the issue here. What is is how Capone is literally trying to KILL his teammate who is acting compassionate to his race's saviors. Pekoms was convinced to go because of having little choice and being indebted to Sanji. He actually doubts that Luffy can legitinately beat Big Mom, as he's stated several times. He still has loyalty towards Big Mom regardless. And following orders justifies killing, especially to the perspectives of the heroes? Stop treating betrayal as if they are all equally corrupt or positive actions. Context and reasoning matters.
What has Capone done besides attempting to kill Pekoms… twice? An action condoned by the other members of the Big Mom Pirates, mind you. You just can't compare that to Big Mom actively racketeering and destroying entire kingdoms. That's really weak for a supposed major villain.
Also, what is the basis for her changing her personality just like that? What would Luffy need to do for that to happen? If we're gonna go that route, then I could apply the same logic for Capone, especially with him showing more care to his family in a single scene than Big Mom has ever did in the entire arc. There's a reason Chiffon and Praline are switching sides and being more supportive of their new family than their mother.
No offense to those who support Big Mom as an ally... it could happen in a far-off future with the right circumstances, but I just find ridiculous the notion that Big Mom is being built up as a victim in this arc, when the entire reason this plot is happening is because of her and she's by far the most oppressive element in it. She started this shit. If it weren't for her, Judge wouldn't go after Sanji, Capone wouldn't go after Sanji, Luffy wouldn't go after Sanji... and she's doing it just to acquire more power. Having Judge or Capone become the actual villains when everything they've been doing so far has been under the influence of Big Mom would feel like a big cop out, in my opinion.
Oh, and let's not forget the kind of people that Luffy opposes the most and ends up fighting anyway. Those who restrict the freedom of his friends. Guess what Big Mom has been doing this entire arc to Sanji, Jinbe, Pudding... I'm actually fully expecting Pudding to be the catalyst to give Luffy resolve to put her at the top of his list.
I do feel that she needs to pay, regardless of whether she changes in the end. She's responsible for most of the shit that's been happening. Sorry if this comes as too harsh.
(or that he goes always longer than scheduled).