I think the framing here is just absolutely shocking because, as OP acknowledges, what Ezran and Rayla were about to do were MURDERS (and in Ezran's case, would have led to everyone dying). And then Ezran and Rayla are let off the hook because external circumstances prevented them from doing their murders and then (at least in Ezran's case, not Rayla's) felt...kinda bad(?) about it.
But for some reason, the person who REALLY went "too far" is the one person who was willing to make the ultimate sacrifice - something even the showrunners themselves called heroic - to save everyone. Somehow Callum is judged as extreme because he’s held to the standard of “make choices that protect everyone without making personal sacrifices, using dark magic, prioritizing some people over others, or causing anyone emotional or physical pain"
Basically, attempting to murder someone but being stopped is somehow less morally problematic than sacrificing yourself to save everyone. OP had to essentially invert conventional morality just to get to the conclusion that Callum is uniquely morally flawed.
