Not always. Cyclops didnt get a free pass. He was ostracized by the superhero community at large, shunned by the X-men and was a fugitive for years. And this was despite everyone knowing he was possessed and the crimes he committed while possessed were constantly thrown in his face. So yea, I cant agree with you that possession always grants a person a free pass.
Its not a few pages in one book. Its well over a decade and multiple writers and books that have formed people's opinion on modern Wanda who has had a very consistent history of recent screwups. Hickman didnt help it but he surely didnt start it. The Wanda we saw in Empyre was reminiscent of the character in recent history. I think Hickman actually did better on her in regards to her guilt about M-Day bc thats not something other writers have really highlighted. She showed vulnerability that kept her from looking like the uncaring psychopath that was unaffected by what she had done as we got with Remender in UA