For all I've said, I do acknowledge (and I think most others would too) that vehicle drivers take to the road with a sense of privilege that is often not given to them by the law. I suspect most us as pedestrians, cyclists and indeed drivers have encountered this at some time, in some form or another.
I remember many moons ago (so many moons ago in fact that I think Adam had not yet been given their cowboy suit) when I lived in East London and used to cycle to university in central London. I was cutting across standstill traffic in Shoreditch (this was a time when there where only rats in Clerkenwell's empty work spaces, and the Hoxton hipsters where yet to be even a yearning in the loins of their parents) A driver wound down his window and simply said "no tax, no insurance". It baffled me then as this was the first time I'd heard that yet-to-be mantra. I reflected upon it, and obviously remember it still. Yes, he was undoubtedly pissed off by being stuck in traffic and perhaps envied that I could simply weave across it. But it also reflected a sense of entitlement he thought was given to him by virtue of him paying 'road tax' (and let's not have that debate) and insurance. It told me he thought I had fewer rights than him to be there.
That is the case still today. Vehicle drivers almost routinely make such assumptions, over one another even. T'aint 'right' is it?
Which brings us the question (partly) posed by the OP - how do we go about correcting that assumption of right? As I've inferred in numerous posts, in this and other threads, I'm not an 'in your face' kind of person. My short tempered and verbally abusive father unintentionally taught me how to seek the placatory path. Some might call it cowardice, I call it self protection. So I'm by no means an activist. But I do admire, and acknowledge the need for, people to take up that role - even when I might disagree with them. I'm thinking of all fields of activism here; Extinction Rebellion to Mary Whitehouse (and her NZ kindred spirit
Patricia Bartlett - now there's a biopic) etc. We need activists. They highlight where we are and show us where we could be (where they believe we
should be) I further accept that we also need sometimes/always to offend and disrupt if we want change.
So, yes, I see that thanking drivers merely offers confirmation (unintentionally though it may be) to them that they have a right that, by law, they don't actually have. We are unwittingly supporting the status quo. To change that, we need to rattle those cages.
Will I start giving the finger to a driver who stops for me to cross the road? Hell no! I'm way to timid to engage in that sort of behaviour! But I can see why someone might. Neither would open aggression be my chosen method. I'm much more inclined to take the 'lead them to the water, even if they don't drink' path. But by whatever method, I would like to see the vehicle drivers assumption of right to be at least challenged, ideally dissolved.