The content of the posts I read are obviously not mere reactions to the past.
In essence that is exactly what they are, along with our personal traits and mental abilities.
The content shows clear evidence of thought processes which are influenced by past events, but with added consciously driven directives to communicate personally conceived ideas and comment. The source of such directives comes from within the present state of conscious awareness of the person making them.
Too simplistic, Alan: you're simply ignoring what you find to be inconvenient.
If we are unable to have done anything differently, we have no freedom because what we do will just be an unavoidable reaction to past events. There can be no concept of freedom within chains of inevitable cause and effect.
A consequences that scares you because it negates your bespoke religious beliefs. That you have a degree of agency and experience the feeling that you have free will doesn't exclude you from being as subject to determinism as the rest of us - maybe, as it says somewhere in your holy book, you need to put away childish things (in this case simplictic and illogical religious beliefs).
I see no fallacies in what I post.
I know you don't: and that is a problem you really need to correct.
How can you possibly claim that they were incapable of doing anything differently?
Because unless randomness was a factor, and as a thought experiment we imagine that time was replayed so that all the circumstances were precisely identical, including your physical and mental state at that time, then the outcome (whatever that was) would be as it originally occurred - unless there was an element of randomness that was beyond your control.
So, to enact this thought experiment, if I imagine rewinding time (and my domestic circumstances and physical/mental state, and also that of 'the boss') by 24 hours to breakfast yesterday morning I think that I would have exactly the same as I actually did yesterday, given the risk of randomness is low.
Do you profess to know everything about reality?
I don't think anyone here professes that they do, since to do so would be idiocy - but you know that.
I do not claim to know everything, but I do know sufficient to conclude that the content of our thoughts, words and actions could not have been entirely determined by uncontrollable reactions to past events.
Ignoring your usual hyperbole this, of course, is your greatest fear and threat to your faith: surprised you can't see that by now since it has been pointed out to you often enough.