Is AUTHOR wrong in the post ? POST : Obvious throwaway because I have friends who know my personal account.

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So I've known my wife for 9 years, we dated for 5, and we've been married for just under 6 months.  She comes from an insanely toxic family, she was emancipated at 16 and to this day refuses to speak to any of her family. They are all addicted to meth and her sister to meth + anything she can get her hands on. Her sister has 3 kids, ages 9 months (F), 6 years (M), and 13 years (F). My wife began taking care of these children when the first was born when she was only 7 years old because no one else would. For whatever reason CPS never took the kids away despite near constant monitoring and the last my wife knew of these kids was 3 years ago when she permanently cut her family off. 

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Her parents always assumed she would adopt any children her sister produced (this actually was the beginning of the rift that led to her cutting her parents off) and were never shy about it. When we started dating (She was 15, I was 17) I told her that if she adopted those kids then the relationship wouldn't work out because if I am having kids they are going to need to be my own. She agreed and said she had no desire to ever adopt those kids. 

  
I just deleted like 5 paragraphs worth of useless details because I'm just ranting. I will just get to the point, so out of the blue last week she tells me that she feels guilty about leaving the children behind and she is planning on reaching out to her sister to formally adopt them.  I told her hell no, I made it clear very early on that I do not want to raise those kids. She told me that she assumed I would "grow out of it" and accept them. We argued and have been arguing over and over for days now about her decision. She has since reached out to her sister and has started the process of adopting the children. The oldest girl is pregnant, the middle child is a decent kid, and the youngest one only got out of prenatal ICU 5 months ago due to the mother's incessant abuse of drugs during pregnancy.   I am 22, she is 20. I think even if I wanted to adopt these kids I would still want to say no due to our age and financial situation (She works at a make up store, I work at a grocery store for fucks sake)

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I haven't straight up told her that I am planning on leaving yet but I've already told my parents that if she doesn't stop then that is my plan.  Am I the asshole here?