Earlier quoted context omitted.
Because they _do_ have something to do with _actual_ free will. But this is the problem right there, you call it actual free will and someone believing in magical free will will deny this and call magical free will actual free will. Sure, one can do this, overload the term, and figure out from context what kind of actual free will is meant in each instance. But would it not be much easier to give up on the term free…
It's similar to how both people who believe in phlogiston and people who believe in chemistry call fire "fire" - or how people who believe in the life spark and people who don't call life "life", or how people call light "light" regardless of whether they believe in the ether, the standard model or something else. No matter the academic discussion of what free will is or isn't, we still have to address the fact that…
The crux of the issue is that you're wrong here. Humans have this vanity that we're special, but we're really not. We behave according to the same rules, we're just relatively complex systems within those rules compared to dominoes.
When most people think of "free will", what they actually mean is "unpredictability". That's why nobody thinks dominoes have free will, some people think animals have free will, and lots of people think humans have free will. It's much harder to predict human behavior from the point of view of a human than dominoes, but to a superintelligent AI, we're just dominoes.
> accountability and responsibility ... morally blameworthy.
It's actually very simple and doesn't require any such notions. If there is a thing that is causing you or others harm, you act to prevent that thing from causing harm. There's no difference between a murderer and a deadly snake in that regard. I'm not going to ponder whether or not its morally blameworthy as I remove it from my house.