For the italics:
Thing is, not all 'bad actions' are morally equally bad. It would be pretty disingenuous to present it as so. There are some that are definitely worse than others, which isn't only measured on the action itself, but also the context and motivation.
In a prison, ideally all of the people in there has committed a crime, which makes them all criminals. But would one consider them all equally morally bad? No, because there are different crimes that require different amount of disregard for other human beings or lives. Someone that has to serve time because they can't pay their parking tickets is not as bad as someone in prison because they kicked a dog to death.
Even if you take the same crime, motive still makes a huge difference. Say a person killed a man because this man raped their daughter and got away with it. Now another man killed someone, and their motive was because the victim was black. Would you really look at both and call them equally bad?
Motive matters. Context matters. That goes particularly for talking about the morality and likeability of characters on a show such as the 100. If a story is trying to sell me the idea of the character X being a flawed hero that just messes up sometimes, it needs to not make that character do things that go into the area of irredeemable/actions of a villain.
Jasper fried 300 Grounders at the end of S1, but I've never seen fandom hold that against him, because (from my impression) its understood why. Its known his actions didn't come from a place of selfishness or outright bigotry. His actions were by far tied primarily with that if he didn't push the button, him and all his friends would had been dead within a couple of minutes.
Of the current main cast, no one has committed the same or more horrific actions than Bellamy, with so many of them having morally shitty motives. That is in part why I'm not here for the woobifying, or justification that relies on endorsement of xenophobia and imperialism that is tied intrinsically together with white supremacy. And on top of it, he has dodged any real consequences almost every time.
Pre S3, Bellamy already had a bunch of morally horrific actions from S1, where most people let it go as a result of his first redemption go around including myself. Bob put in one hell of a performance back then. Bellamy gets less sympathy from me because his actions have been based on pure selfishness + controlling behavior in S1, and in S3 it was based on xenophobia / misogynistic story telling / man pain, and in S3 it isn't the first time either that he did really awful things. The xenophobic motive of his actions makes irredeemable to me alright? I know it is not a deal breaker for everyone, but it most certainly is for me. Likewise characters that commit acts of murder based on racism/homophobia/sexism are trash to me.
All the bolded parts are basically canonically incorrect or assumption presented as fact. I don't mind discussing the various characters critically - particularly Clarke where I find her much more dark grey with tipping her toes into black area than most of fandom - but we need to have a common base in the show. Also think would need to take it to a different thread.
Would just say at least look up the symptoms of PTSD. Clarke has almost none of them. She has several for depression, which is very frequently a part of having PTSD. Only other thing is can say she might have nightmares (but she doesn't have invasive memories, flashbacks or missing pieces of memory). I'm bone tired of fandom declaring that everyone and their dog has PTSD, when many of the characters doesn't show a single symptom, or any where near enough to qualify. End result is making light of what PTSD actually entails and spreading misinformation about it. Experiencing a trauma or multiple ones can result in PTSD, but it is not guaranteed, which is how parts of fandom and the writers talk about it.
Also implying Bellamy wouldn't get away with the chip part and Clarke did? Lets not pretend Bellamy hasn't gotten away with matters of dubious consent. In S1 he was sleeping with multiple aged approx.14-17 year old teenage girls that he held a disproportionate power difference over. Fandom completely hand waved or even made shit ton of jokes about that. Even now, there is a gifs popping up about how "this is the guy that had threesomes but lol he can't flirt proper with his lil Princess wuw". Large parts off fandom complete ignores the creepiness and dub con, and even made into something that is presented as something that shows he is this "stud/hurr durr Alpha male". People are straight out making jokes of it, despite several rape victims have expressively asked for people to stop, lots of his fans pretend like there was nothing creepy there. Even Linctavia fans will admit and show much greater understanding for people taking issue with their age difference and development. Clarke wanting to force the chip? Absolutely the worst her character has ever been, followed by her becoming spineless to facilitate Bellamy's redemption/barely giving any negative reaction over Bellamy's and Pike's xenophobic mass murdering ways. How Clarke treated Niylah is also up there in the top 3, because she was an utter d-bag to her and showed so little sympathy or care towards someone that been nothing but kind to her, and risked her life.
Last paragraph about Representation:
Not all representation is good representation. The way you describe Bob as a biracial man representation-wise is rather shallow view point as it omits the problems brought upon various story telling decisions that has been rightfully called out by PoC, fans that are part of groups often victim of xenophobia and particularly Filipino fans. Representation talk under spoiler cut, as it is not really episode 4x02 discussion, but brought up here.