Jeffrey Denning: Have Plan to Kill Everyone You Meet

Well...alrighty, then.
Jeffy Denning is a gunloon and professional bullshit artist who has never been in a gunfight.  But like most gunloons, Jeffy feels pretty comfortable telling everyone exactly what they should do in a gunfight.  He has written "20 rules for winning a gunfight" in Guns.com--a firearms industry astroturf site.
Some of the "rules" Jeffy lays out are, well,...unsound.  Let's take Rule 1: " Be prepared to stop a co-worker, a neighbor, a teammate, friend or even a relative.  You may have to physically hurt or kill someone that you know or someone you’ve talked with or like or someone you think you know well."
Not so bad.  After all, most gunloon shootings don't involve strangers; they're usually friends or intimate acquaintances.  But here's Rule 2: "Have plan to kill everyone you meet."
Uh oh.  If you take Rule 1 and Rule 2 to heart, this means when you see your kindergarten-age daughter--you're not thinking about how cute she is and how much you love her.  Instead, you wondering if that garden hose could be used as a garrote.  The guy in the pew in front of you at church?  Maybe the hymnal could crack his skull.  This thinking probably is indicative of Denning's job-hopping; after all, few employers are wild about having employees that are consta
ntly thinking of killing everyone.
Point is. should someone who is constantly harboring homicidal thoughts be allowed near so much as a butter knife?