I don't think the moral considerations are that difficult.
Would you accept NSA surveillance if they said it was so that your descendants could understand you, and "For Science"?
Would you accept NSA surveillance if they said it was so that your descendants could understand you, and "For Science"?
It has often occurred to me that my own children could be reading through my comments years from now. Probably not. There's a lot of them. Of course if they can search, well, who knows.
All the same, I think you make a good point.
If I trusted the NSA to actually do that, I'd have no problem with it.
The problem is, I don't have the choice of being surveilled by the NSA, and I don't trust them. Just as the Senigalese would have no choice in redsummer's proposal, and many reasons not to trust outsiders.
What would they do if their camera recorded a violent act between tribe members, or against a child? They might feel obligated to act, or not act, either of which could have dangerous consequences.