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I think the theory is overheated Fanboy/'Girl nonesense...
But real talk... I'm sorry about liking Wanda and all but... How many were injured or possibly killed due to Wanda's actions helping Ultron in A2? How many died in Nigeria due to Wanda's miscaclulations?
If you were in universe, as a civilian and not a fan of a character played by an actress one likes... How would you or anyone "feel" about Wanda Maximoff? Forget that you are a fan that knows of the character's backstory or intimate with the contours of who/what they are supposed to be, again, as characters... When writing this the other characters reflect the fictional world they are supposed to live in.
Wanda Maximoff is a potential nuclear weapon. Sob backstory or not, the government in the MCU world would be irresponsible not to have plans, contingencies and policies with regards to someone like Wanda.
Plus... Jesus, when are we gonna learn that we literally buy this stuff FOR THE CONFLICT. Drama/Action with no conflict has not interest for me and I dare say, most other fans. Wanda is a fiction. She can't actually be hurt or aggreived. And no one wants to see something where all it's about is how Awesome Wanda is. Story has to progress. Heroes need obstacles to be overcome yadda-yadda...