2. He doesn't explain it at all in his email. This is akin to writing a misleading news title and say that you are innocent because people should not be gullible and believe everything on the Internet, and should do their own research.

3. He purposefully chooses to use that bad title, even though nobody forced him. It was his personal choice to mislead people.

But it was Troy's decision to use that misleading title. Nobody forced to him to use it in such a misleading way in his email signature no less! He had so many options he could have written, but hr specifically chose the misleading one.