How do we explain patron privacy in a world of target markets?

how do we explain patron privacy in a world of target markets?
Let me tell you: there is no organization in the world LESS likely to use your email address for anything other than automated overdue notices. We won’t even email you when it might be helpful — we won’t email you about library closings. We won’t look at your card record to see if you have kids and start emailing you about story times and summer reading. We will not ever sell your email information to anyone, and, at least in theory, our databases are much more secure than, say, those of some newsletter you sign up for online (I’m not actually sure about that last point, but it should be the case).