All there needed to be was for the handful of initial variables that were set at the "beginning of our universe" to have such values that their interaction over time would lead us to rational thinking and therefor our understanding that there is no "free" will.
Simply put: If I explain to you why free will is an illusion and you stop judging, then it wasn't a "free" will. It was a cause-and-effect situation.
My explanation would be only 1 variable in your system (out of an infinity of others, if you assume that you can always continue to "zoom in").
Now, if that 1 variable does anything to your decisions or not depends on all the other variables as well, i.e.: You may have gotten a very religious education which may lead you to accept beliefs put forth by other as "the truth", without questioning. Since one major point of religion is "free will", I'm not sure "my explanation" would do anything to your decision making.
If there is no free will, then all we do is predetermined and arguing is pointless, because, by definition, it cannot change anything because everything is predetermined.
The arguing is just 1 variable in the system. It was bound to happen because it was caused by other variables (i.e. us being online, someone posting the article, etc.) and it will interact with other variables to lead to some amount of change. It's not something that "we control". (Our brains do, but they are the result of other variables, such as our genome, environment, etc.)
I don't get that - with predetermination, there are no variables at all. Its all a mechanism set in motion at the big bang, turning inexorably toward ultimate entropy. We're just some predestined middle state right now, with no choice and no say.
All that would mean is that you were incorrect before when you had some mystical idea of what choice meant. Choices still matter (in the most literal sense: they are material). If complete determinism is true, the choices we make and the things we say are part of the causal stream that leads to other actions, even if that stream could only ever go one way.
On top of that, how would choice make more sense in a random universe?
All there needed to be was for the handful of initial variables that were set at the "beginning of our universe" to have such values that their interaction over time would lead us to rational thinking and therefor our understanding that there is no "free" will.
Simply put: If I explain to you why free will is an illusion and you stop judging, then it wasn't a "free" will. It was a cause-and-effect situation.