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As a Macintosh user like me, you will be resting secure in the knowledge that your computer is much safer than those of your foolish Windows-using friends.
However, it turns out that our superiority is being mistaken for smugness by some bad people, and they are starting to write malware and viruses which could harm God’s own computers.
So, I’m recommending that you install the new, very good and completely free (it’s a privilege to write software for Macs so, obviously, it’s free) anti-virus software for Macs from Sophos. You may need to take care that your increased level of superiority now that your Mac is doubly secure isn’t mistaken for such a level of smugness that you warrant a punch in the face.