I think the difference is those are portrayed in a way where you're still supposed to be rooting for her. Every one of those people, as brutally as they were killed, were monumental assholes. And instead of letting the viewer grapple with the fact that they're on the side of a sadistic monster torturing someone to death, to explore the dangers of prioritizing vengeance over justice, the story just moves on. There's a lot they could have done to bring the consequences of Dany's shortsighted rage into perspective, really give the viewer several moments of "yeah, I see why she did it in the heat of the moment, but damn, that's fucked up". Then, her subsequent heel turn would feel like the logical conclusion of her arc.

Then just give her time to be the main antagonist for a bit. What's the point of spending a series long arc setting up a powerful villain if she's not actually given any screentime as the villain?