Are you a public figure? Can your reputation be ruined by leaking such data, i don't know who you are(don't even want to know) but why would valve want to ruin your reputation? They just post your library to the public or send a mail to your loved ones?Sure I could be traced by IP, but that is only traffic information and that isn't normally saved for eternity. Also traffic information isn't a direct connection as payment information (credit card data) or your name and address that is stored by valve. Suing a company will not repair any damage done to your reputation or a data leak that is used to pressure you.
I still think that's too paranoid.