that is the biggest security threat, so many of them are surprised when i say as an IT guy that i hate macintoshes and would never buy one.
always saying "but they don't get viruses" (using virus as a blanket term)
and its an attitude like that which will be your downfall.
just like here, the biggest vulnerability is manning the keyboard and mouse.
and if your under the false assumption that your system can't be breached then your guard is down big time.

thats my two cents anyways.