I don't see how Rag is refusing to play the story. He wants to ask a party member to leave. He doesn't want to initiate murder to make it happen.
I don't know how many times it has to be repeated Shadowheart's absolute duty is to protect that artifact with her life and deliver it to Baldur's Gate...it literally does NOT matter what you want, that is the choice presented by the DM. That is a hard rule set by the DM, either she tags along or you HAVE to kill her for it. That is not a suggestion, that is not a maybe, that is a condition set in stone by the background, character, and mission of the NPC holding the artifact. Now, either you accept the rules set by the DM or walk from the table. Very simple.
I'm not sure we're having a rational conversation.
The game gives me the option to ask her to leave...
I ask her to leave...
She leaves the party, but stays in camp...
Hey, that's not really leaving...
Why do I have to kill her? Not only is she sitting in camp all day while not in my party, she's also sitting in all my camps, clearly following me around to different locations. That's obviously a weird thing. And it's probably just an early access thing. I'd wager that there'll be a difference in the full release that will make much of the conversation in this thread look silly.
Anyway. The suggestion is that the game can:
1. Let her leave the camp (and find a way to get the artefact to the player), or
2. Let her initiate combat so Rag isn't the one initiating the murder, or
3. Some other way to get the artefact in the main character's hands.
Why is this hard to understand?
No one is confused about the importance of the artefact and it being in Shadowheart's possession at the start of the game. What you're saying isn't complicated. On the contrary, it's kind of basic. I suspect the reason you keep repeating yourself is because you're not actually listening to what's being said.
Also, the scene with Shadowheart returning all insane was from a much earlier patch. It's not even in the latest patch.