On the contrary, common sense--as most of us understand it--has nothing to do with this. The rationale is to gather all data that's potentially useful at some unknown point in the future, and hang on to it for that unknown eventuality.
Case in point: all the license plate surveillance stories that came out today. (Not sure why today, this has been well understood for a couple years now.)
Every single government official and LEO talked to about this data say that gathering and keeping the data indefinitely on 260 million plates, in order to apprehend just 136 individuals, is good practice.
If that's your definition of common sense, I want nothing to do with it.
And the point of this "hops" story isn't whether they're looking at everyone now, it's whether your data is being automatically gathered and stored today to construct who knows what perspectives about you in the future. And at 3 hops of potentially useful data, odds are yes.