As for Dave, yea he isn’t the brightest person is he losing the Hat etc. but options are kind of limited here I believe.
What are the options?
1) Leave Regina behind in SB — She’d find a way back to FTL and Snow has already said no to this one. She’s too good hearted and won’t leave Regina behind.
2) Take Regina to FTL and lock her in Rumple’s cell — honestly, this seems like the best course of action. While Snow and Charming may be protected if they return to FTL because of the charm Rumple put on them, Emma is probably not. Locking Regina up makes sense. Except, I don’t think David is taking into account that she’d probably manage to escape somehow.
3) Kill her — The Charmings won’t do that.
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"He was a lot of things to me" "The only conclusion was love"