Why do people let their yahoo email address book account get hacked?

Why do people let their yahoo email address book account get hacked? WHY WHY? I’ve been receiving numerous email from people I know for sure their email account address book somehow got hacked and spam email has been sending out to all their address book records. I know it’s possible for hackers to hack people address book more easily than their actual email account password. Especially with yahoo.

Please people if you use email such as yahoo and gmail, be careful, don’t get your email hacked. It’s bad!

Like this sample

 

From:
To:
Sent: Wednesday, January 30, 2013 3:30 PM
Subject: Name hey

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Sender