The horizon problem.

If a human cannot immediately see a negative outcome on their visual or mental horizon based on the knowledge they have at that moment most of their insights or feelings about what problems will occur will be incorrect.

Talking about AI and data is a good example of this. A bit of data here and there seems useless, but the moment you get enough the pattern of your life can emerge from it and suddenly you can be tracked and manipulated with an amazingly high probability. And it's not a one time thing either. Anything mispredicted gets put back in your profile as another data point.