OK, confess. Have you ever used your computer at work to send personal e-mail? Sure, you have. Does your company have a policy against it? Probably.
So, did you fire yourself? No need to answer that one.
The fact is that all companies have policies that occasionally can be ignored because there's little chance of getting in trouble for violating them. Then there are those policies that we would expect to be punished for violating, such as taking your company's computer home