Far as things go, cheating is closer to home for most people than genocide. So a character who cheats on another is easier to hate because many have been in that situation or have loved ones who have been & that type of pain & betrayal is closer to register than things like genocide & serial killing.
Far as the affair, I have found both Scott & Emma get hate for it. Emma is just easier to hate more given her braggart & entitled attitude about it. lol MAYBE Scott does feel remorse. I doubt it, but easier for many to see him as being remorseful compared to Emma. So again, easier to hate someone who does lowdown stuff, feels entitled to having done it, and does not feel the least upset about it. I personally dislike them both for the affair. So I got no dog in the fight.
Triangles tend to do this. Everyone knows about Brad x Jennifer x Angelina. But an even worse one before them we WWE's Triple H x Chyna x Stephanie which started 5 years before the same way.
After Chyna's death, they tweeted condolences and they were ripped to shreds in the comments.
https://twitter.com/StephMcMahon/sta...19592570929152
https://twitter.com/TripleH/status/723129417367732225
Like Emma, Stephanie has shown to be proud of the affair. She says she saw the man she wanted & took him, then said it was Chyna's fault for not being able to keep him. Later she says the situation was bad but she doesn't feel bad because of what she got out of it. Chyna's nightmare was her love story. So when former mistresses say that kind of stuff, it can pile hate on faster than ever. Again, like Scemma, I dislike them both for that -among other things. lol So I got no dog with choosing one side or the other. They both seem like bad people.
Any triangle is messy, especially when two of the parties started as an affair. But in all the ones I know of, both parties of the affair got fair share of hatred on all sides.