I want to explain a few things. As regular DOTE readers know, I don't believe that humans are exercising "free will" because there is no such thing. Thus I am a determinist. Now, when we think about "free will" we (and researchers) naturally think about individuals—his brain, or her brain or, more rarely, my brain.
On the other hand, I've also arrived at the conclusion that the most important stuff going on in the unconscious mind is social in nature. Social instincts (like harmonizing) are hard-wired and therefore wholly automatic, just like fight or flight, negativity bias and many other processes. Thus it might be more appropriate to think in terms of groups rather than individuals in so far as humans naturally and mindlessly form strong social bonds. It is therefore more appropriate to investigate free will questions at the level of large populations or social groups.
There is a great deal of superficial variation at the level of individuals; at the large group level, there are only predictable behaviors because the unconscious mind has free rein, unencumbered by weak and ultimately deceptive "deliberative" processes in individual minds.