Because it's a poor rhetorical tactic, one used quite often in this and other topics, that confuses the subject rather than adding clarity and mutual understanding. Redefining the subject of a debate in the middle of such a debate is a recipe for talking past one another (which these two have done at length multiple times and never seem to quite understand how much they're talking past one another, or at least never acknowledge it so as to "win" more) rather than coming to a better understanding. Neither one can be wrong or right because neither really acknowledges the other, they're just sort of talking about related (but different) subjects at the same time using the same term in different ways, to the consternation of passer bys who end up joining one camp or the other not realizing they can easily be in both.
> Telling people that they don't have free will, in real terms, amounts to telling them to suck it up while the evil, predatory people in the world, who know perfectly well that they do have free will and have no compunction about exercising it at others' expense, take all their goodies, instead of choosing to fight back.
That's not what it tells them at all, and indeed this is a common point of confusion that could be alleviated without all the talking past one another. A better synthesis would be:
- Acknowledge one does not directly author one's own thoughts (either by way of the vast literature of neuroscience or simply closely observing the nature of thought)
- Acknowledge the vast role of forces outside our direct individual control in our understanding of ourselves and others
- Acknowledge our ignorance of full causation of any given thought or action and the scoping differences of emergent systems
- Acknowledge regardless of the first two and because of the third at an individual and societal level there is very real meaning to responsibility and attribution of action to a locus of control (be that individual or grouping of individuals)
Compatibilism (of which Dennett is a proponent) more or less just says the 4th is actually compatible with the 1st. And that's completely reasonable, but we'd save a lot of time in these debates by taking great pains to acknowledge the difference in scope and context as opposed to arguing which one we want to call "free will."