Knows, what it sounds like you are describing is knowing the difference between. Knowing good from bad. I am speaking of knowing good AND bad. As in experiencing. An actual knowing. They could not do this without dying.
But lets say for argument's sake that it means what you think. (though I disagree) Knowing of bad before you are ready to know not to choose it... well, that might well lead into you choosing it, or thinking that the consequences might work to your favor, instead of your harm.
Peace,
tammy