Iirc CIA study seems to suggest that there is a point of diminishing with data. At some point, it starts to make a human agent overconfident and over reliant on the data to the point where it is worse than having less data. Now, add the fact that we have nation states as well as other actors working hard to influence us. How difficult wood it be to plant data into a mass surveillance system? Even assuming every politician and every government employee has perfect ethical and moral standing, can we completely trust our surveillance system?

My thought is this: likely whatever your trying to keep secret, out adversaries have seen it.