With so much information stored electronically, we have some risk of losing our private information through malicious, intentional attacks. On a personal level, the problem more often comes from much less sinister sources. Coworkers using our computers see information that they should not. Our children may see jokes that were not intended for them. Our spouses might see an email about their surprise party or birthday gift.
Many companies monitor all email, including the personal ones.
That is why individuals need a user-friendly tool to protect themselves.