Observation tells us it's a lost cause to teach people about privacy/security of this type and have the large majority of people observe prudent ways of preventing their data from leaking. We've known about this since before the internet when people would chuck old documents in the garbage under the assumption no one would ever bother to go through their trash digging for information. But, we've learned from police, private investigators and espionage accounts that huge amounts of data can be extracted from trash simply because people aren't careful.

We also know there's always been a small percentage of people who have been careful, they're the ones who never throw out old accounts, letters, envelopes or even notes with phone numbers on them into the trash but they're so small in numbers that those who are scrounging for information know that the majority of their pickings will be successful.

The only effective way around this is to build systems that automatically obfuscate data from anyone but their owner. As we know, this is easier said than done.