> So sense data are necessary but not sufficient, especially for logic.
But they are sufficient.
> it does not follow that what happened before will happen in the same way again.
Yes, that's true. It does not follow that sense data are insufficient. All that follows is that induction is not a valid mode of reasoning (which is true -- it isn't).
> The easiest way, IMO, to see why it won't work to build up human knowledge from sense data is to realize that the human knowledge system is a distributed system.
Nonsense. Distributed systems can do logic. Being distributed is completely irrelevant.
But they are sufficient.
> it does not follow that what happened before will happen in the same way again.
Yes, that's true. It does not follow that sense data are insufficient. All that follows is that induction is not a valid mode of reasoning (which is true -- it isn't).
> The easiest way, IMO, to see why it won't work to build up human knowledge from sense data is to realize that the human knowledge system is a distributed system.
Nonsense. Distributed systems can do logic. Being distributed is completely irrelevant.