Sure, but also worry about the government. First, the government has no more business knowing your personal details than any other organization. If they want info, that's what warrants are for.
Second, people tend to thing of the government as some sort of single entity. It's not. Government is made up of people: some good, some evil, most just trying to get through the day. There have been numerous examples of the evil types abusing access to personal data, for a variety of personal (usually illegal) purposes.
The worry of everyone else is an off-shoot of Big Gov's needs, not the other way around. We can worry about the symptoms or we can worry about the root problem. I favor the latter.
What activities is government monitoring using commercially-available data?
Exactly the point. We have no idea. No fucking clue.
And making that point gets down-voted? It's nice to know HN has so many Big Gov "influencers".
As long as Big Gov is buying this abuse will continue. Sure there will be staged events by Congress, etc. but it's not going to change.