4. Robin was killed off so the WickedSisters storyline could continue without reminding the viewers what Zelena did to Robin. The writers need Regina to be in a certain headspace and they can’t do that with Robin around to keep her happy.
That’s what I think it is.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy