The dog argument was cute. But the dog also doesn't make a searchable, indexable list of all your personal information.
Someone will inevitably make this though, and it will inevitably be abused.
Plus what if I start switching search parameters from say, 'planning a terrorist attack' to, likely to to vote one way, believe on thing, or be of a certain religion.
We will trade all our privacy and the nefarious people will switch to a new method of comms...like they always do.
So part of what makes this work is that it's not an index. As opposed to doing general storage of people's data, this restricts a surveillance operation to only be able to identify specific concepts.
that's strange, i would have assumed that they would be averse to a tool that doesn't give them un-restricted access to the data. right now, the dialogue is "privacy vs security... take your pick" but this breaks that rhetoric... showing that it's a false choice.