Originally Posted by Acting Like Godot
The prediction itself, or the non-prediction, changes the outcome. Therefore it does matter whether we tried to predict or not.
Your very attempt to observe the butterfly, alters the butterfly effect. For example, you seek to gather information about which way the butterfly is flying, but to gather such information, you get close to the butterfly, and frighten it, thereby causing it to fly away in a particular direction that it would not have flown it, if you had not tried to gather information about it. Therefore the butterfly effect is altered.
It wouldn't matter.
From an external, global viewpoint where I could theoretically see all the pre-conditions for an event to happen, I would take into account your obervation and effect on the butterfly effect and would know from all the causative pre-conditions the one and only outcome.
I'm not saying I agree with it, just explaining the possible case for no free will. No matter what you did or didn't do, the pre-conditions would produce the one result. The current state, whether you are altering the butterfly effect or not, would generate only one certain outcome based on the causative factors in the current state.