And why should they be prevented? If a random stalker can pay for info about you, shouldn't your government be able to? Why cripple the state and enable the creeps?
Profiling has always been interesting to me from a commercial perspective, too. I used to have access to a database that would tell me if a certain sports fan was a gay republican, because the cookie-based mass-site-collection profile-generator needed to be able to tell advertisers what kinds of users they were selling ads to. I thought it was wild that you never needed to create an account for us to mostly-uniquely identify you. And that was 15 years ago.
Don't like it? A small handful of states have data privacy laws now. Tell your reps your state needs one too, and a federal one for good measure.