Holy lord, this is the worst case I have heard before. Now imagine a scenario where the guy was a known terrorist and was suspected to have met someone on that train. With what you are saying now, it means you sure would be been getting some water boarding torture in an undisclosed facility just because you sat next to someone on a train.
It's pretty disgusting what these companies are doing with our data. And who knows what else they have been digging and selling out for profit.