In your first quote, you cite that we are shaped by random things such as genetics and events in life. Now I ask, what more is there in life then genetics and events in life (unless you believe in God, which I assume is beyond the scope of this thread)? Which is why I say that you are basically stating "your life shapes your life".
Now when you talk about randomness in life, you seem to be doing no more than acknowledging the aspects of life (your genetics and the sum of the events you experience) as random. Of course genetics are random (in the sense that they are beyond your control). Of course you cannot control many of the events in your life. And nobody denies that these things are what shapes you. The only tangible and addressible question then, would be whether or not we have free will to control our lives within our given set of life-parameters (genetics and events of life).
When we talk about free will in terms of the free will we have within our given set of circumstances, there are two schools of thought:
a.) (the one that sims seems to acknowledge in his quote) is that we have no free will whatsoever, because the decisions we make, even if they may seem like free and conscious decisions, are determined by our genetics and life events just as much as anything else. So when we, for instance, choose to work hard or be lazy, we are essentially not choosing, we are simply acting in accordance with our character as defined by our genetics and life-events.
b.) (the one I agree with) is that yes, if we boil everything down to genetics and life-events, everything is quite random and beyond our control. HOWEVER, when we boil things down like this, we are ignoring a crucial aspect of free will, that is that free will functions within the parameters of life (genetics and life-events), and thus does not need to be excluded from the rules of life, in order to be free will. This is what I mean when I say that sims is uttering a tautology. He is essentially stating that "our lives determine our lives, and thus free will is a myth". I would argue that yes, our actions under free will are determined by our genetics and life circumstances, but that does not make it something other than free will. So basically,
of course our decisions are going to be determined by our lives (genetics and life events), for they have nothing else to be determined by. That does not, however, mean that our decisions are not free will, but rather just free will functioning within the parameters of life, because those are the only parameters in which we exist.
Does ANY of that make sense? If I suck at making my thoughts coherent, let me know, and I'll try to clarify.
p.s. in my opinion, this is one of the more interesting threads in OT I've seen, nice one Sims!