Demileto, I don’t think you saw the whole context. I started by saying I don’t think Regina should kill Greg as she killed his father and at a time when he was already disturbed by the loss of his mother. My original hope was that Regina would not consider Greg a satisfying favorite kill, that she might hesitate.
Phee then pointed out that Regina likely does not see it that way. Her warning Greg to leave in Granny’s was as close to warm and Fuzzy Regina as she is capable of being with someone who (in her messed up mind) rejected her. I do not apologize or excuse the wrongness of her, or him in their actions towards each other. Yes, Greg indirectly led to Regina’s son losing his father (and he directly set up a situation that would have killed her son’s entire family, including her) but I doubt Regina feels outrage about the rest of Henry’s family. She was going to kill them too, remember. Regina’s level of empathy is still vastly underdeveloped compared to her own ego and issues. She couldn’t point out his hypocrisy without revealing her own.
I don’t think either one has any love lost, but what I feel as an audience member is that Regina should not “win” even though his retaliation took on a larger scale to what she did to him personally. Someone else could kill him. He could die tragically, he could get shot by Tamara, these are things I have suggested. Even being killed by PP offhand when they show up to illustrate how cruel and boss PP is. The one way I don’t think Greg should be killed is as if Regina is the hero finally smacking down the villain. She is not the hero in this situation. Neither is he.
“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass