Right now what we have is free will, without a seatbelt. When an average person become angry or jealous, they may hurt someone, but usually not too badly, but when a mentally ill person becomes angry or jealous, the sickness in their brain may leave their violence unchecked, as in Sandy Fork.
Solzhenitsyn said, after years on observing mans depravity, that the line separating good and evil run through the heart of every person. We're all in a way guilty of the same sin.
The "Eternal life" thing sounds like coercion when you think of it as "do this or you'll be tortured in hell" but the point is God lets you chose to be with him or to not be with him. If God is everything that is good, then there's not going to be a way to make a place that does not have him and yet is pleasant to be, right?
Was it possible to just learn good and evil in a perfect world without all the death?
For example, isn't god supposed to be all powerful, so that he created everything, including the devil, hell, and death? Would it cost him anything to simply make you not die - contrary to a human giving a kidney to another human, which indeed would be a high price to pay. Hasn't god, in fact, also created kidney disease? And what is the sins you are talking about? It sounds to me as if there are conditions for being granted eternal life after all, which practically amounts to coercion again.
Anyway, I really just felled compelled to reply because I thought your reasoning was not all that bad (for a religiously deluded person - sorry :-). I am willing to believe that at least you mean well.