Curate, connect, and discover
What's interesting to me about Jod and his relationship with the kids by the end of the series is that it's so in-between.
It's not "actually I've come to care for these kids and I will give up my plan to protect them" but it's also not just that he's evil and doesn't care about them.
He does betray them and he does a lot of harm. He threatens them and their families and their home in a very genuine and traumatic way. He brings destruction and danger down on their home. He does not make the turn to help them or side with them against the other pirates. He stays on his course, stays a bad guy.
But at the same time, as much as he threatens them (in the pirate horde, in the ship and on At Attin) and their family, he doesn't actually hurt them. (in fact I think the only ones we see him actually physically hurt are 1. SM-33. 2. The werewolf pirate guy 3. the supervisor droid). And I don't know that the threats are empty, but he's certainly very reluctant to actually enact that violence, and his plan might not have fallen through if he had been more willing to hurt them. He's not willing to stop for the sake of the kids, but he'd much rather get through his plan without harming them. And when he KB is falling and he thinks she probably died there is real fear and regret in his face. He didn't want that.
All of this is an outpouring of his misguided worldview. Because again, Jod isn't a villain who can't recognize right and wrong. He knows what Good is, he's seen it. But his problem is despair so he believes that Good is not worth it, and is not powerful enough to make a difference. And because of that he becomes the manifestation of the cruel place he believes the world to be. The good in him is THERE but its not strong enough to really change him, but it's because his despair doesn't believe it can be. And so he becomes the very thing that made him-- he watched his mentor/parental figure killed in front of him, and he stands there threatening to do the same thing to Wim and Fern.
But he doesn't, because he isn't quite the villain that the Empire represents. Even though the difference doesn't come from him actively making a choice for Good, it does come from there being Good still in him, even just in the form of hesitation. Good is still powerful even when he's denying it. And then little ember in him is not what saves the day--that's the kids and their families and the New Republic. But it is there and it does mean that even though he stays a villain there is that moment of Wim calling out to him, there is still that spark of hope that Jod can be saved one day too.