Adam and Eve - Both Had to Sin

I understand talking about Adam and Eve is taking us back to the beginning of the semester, but I was reminded of the story when reading St. Anselm Proslogion. In the first chapter, St. Anselm writes that "...the universal outcry of the children of Adam! He was satisfied to the full; we sigh with hunger...Why did he not preserve for us, as he easily could have done, what we so woefully lack?" Well in my opinion, Adam never stood a chance of preserving the Garden and full humanity for all time. 

Without getting into the debate of interpreting the Creation story literally versus as an analogy, I wonder if the story had to happen the way it did. That both humans, Adam and Eve, had to sin. That if one did, then automatically the other one had to too. Essentially, it wouldn't matter who sinned "first" because order doesn't matter when everyone is going to do the same thing.  

I question this because historically Eve has gotten more than her share of the blame. A common thought is that Eve caused the downfall of man! oh and then Adam sinned by not standing up to her and telling Eve "NO!". But did Adam really have a choice in the story? Did either character truly have a choice if one of them ate the fruit from the Tree? 

The continuing story would not have worked if both of them didn't "sin". Both of them had to be cast out of the Garden. Both had to be cast out into the 'real world' so they could procreate and make more humans. If one of them had stayed in the Garden, human civilization would have looked very different these days. 

I'm not trying to say it was Eve's destiny to eat the fruit and Adam's destiny to accept her offer. However, I do think that neither human would have been able to make it through the temptation of not eating the fruit, Eve was just the first one to go. I think the snake could have easily convinced Adam before Eve that nothing bad would have happen from eating the fruit, and thus Adam would have been received more of the blame for causing the down fall of Man. 

Eve's taken her share of the blame throughout history, but I think placing more "blame" on her is the wrong response to this story.