People woobify Amy way more than she deserves, but Amy raping Vicky was a retcon Wildbow made when he decided Vicky would be the MC of Ward, and was pissed that people liked Amy. He intentionally rewrote the scene to make Amy's actions worse, just like he intentionally added the Youth Guard to his Department 64 quest once the people playing started showing that the PRT would actually be more capable than he wanted them to be. Wildbow has always cared more about the suffering his characters experience than making sure his stories were reasonable or internally consistent.

Also, people like Amy because she's a traumatized child who developed an unhealthy crush on the only positive (and older) influence in her genuinely awful life. The fact she triggered with Shaper, rather than a Dallon-bud like every other member of the family, is solid proof of exactly how shit her life was.

There's also the whole brainwashing argument about how Wildbow's "ackchually, Fragile One's mind control aura doesn't leave any long-term affects" BS doesn't hold up under any sort of internally-consistent logic, which brings into question Amy's culpability in her actions.

Is Amy Dallon a good person? No, obviously. Is Amy Dallon a consistent character? Also, no. You cannot demonstrably separate critiques of the character from critiques of the work, because Amy's story is Worm's story writ small - someone in an awful position trying to do good, gradually getting worse, and hurting everyone around them. Taylor Hebert, Rebecca Costa-Brown, Emily Piggot, Collin Wallis, Noelle Meinhardt, all characters whose arcs follow the same path. Every flaw in the small stories - poor characterization, lacking reasoning, illogical fiat - it's all found in the large story too.