I need to make a stand and prevent history repeating itself yet again
Yes. You do. As AnyFucker has pointed out none of your excuses will wash with them when they're traumatised adults dealing with the fallout.
when he’s not making unnecessary jibes he’s building them up
Well, that's a complete mindfuck for them, isn't it? Never knowing if today daddy likes them or finds them intolerable.
It is also a tactic used by abusers to trigger trauma bonding. It is surreal and disturbing to watch you try and argue that it means he loves them some of the time (in between deliberately abusing them), as if that would somehow make the abuse ok.
You are confusing desperation to be good enough to be treated decently and loved by him all the time with "adoration".
Children are wired to seek acceptance and love from their parents, it's not a reflection on the acceptability of his abuse and that doesn't mean they deserve to be left to be abused.
It is not "simple" for other people to exit abusive situations either. Yet we do. We make the decision to do the right thing and then we start making plans, even if it takes a bit of time.
Other abused people don't leave because they have it easier than you, they leave because they decide it is necessary.