When I was a new Witness, the majority of the congregation were "anointed." They were no different than those who did not claim an anointing. A true spirit anointing does not make you better, stronger, able to leap tall buildings at a single bound. It does not make you smarter, better looking, or more faithful. In the biblical sense - and as the watchtower actually teaches it - it marks you for a different destiny. If an "anointed" brother or sister seems more knowledgeable, it's because they've probably studied the material longer than others. They do tend to be on the older side.
To return to your illustration using Eve: She and "the serpent," whom we usually take to be Satan, received the same punishment. Eve died. Satan will. So who was the more responsible? Perhaps not every watchtower doctrine or practice we dislike is unscriptural. But even if they all were, are we free from the obligation to test what we learn? No. Not even if our parents taught it to us.
The Protestant reformation returned the idea of personal responsibility to the fore. The Latin phrase sola scriptura, meaning “by scripture alone,” set the standard for faith. It is a biblical standard. The Watchtower gives lip service to that, but takes it away by crafting a governing system not found in the New Testament. (Enough of this Greek Scriptures nonsense!) We are not responsible for what they've done. We are responsible for believing what they say.
Arguments that focus on someone else's blame are like a child rejecting discipline by saying, "But YOU ..." It doesn't matter what someone else does. It matters what we've done. This is what the Bible teaches. We see that in Joshua’s “as for me and my household.”