>No because we'd actually act upon it because of purely logical chains (1) of cause and effect, not free will

First of all, the discovery itself wouldn't be an action of "free will".

Second, who said we can act on "purely logical chains of cause and effect" when there's no free will? Whether we act on those chains or not will already be predetermined by the "no free will" mechanism determining our actions.

If anything, as societies we act pretty illogical a lot of the time (heck, even most), for stuff scientifically known to be BS.