This is Logically Known as a Non Sequitur

Publicola points out a "useful idiot" in this story about a mother whose son was stabbed with a knife, and then used that assault as an impetus to form "Mothers Against GUN Violence."

The logic behind that leaves my head smoking like Nomad just before Scotty beamed it off the Enterprise.

Publicola put it well: "Personally I would have thought, 'Since my unarmed son was stabbed with a knife then obviously he wouldn't have been stabbed if he had a gun. So therefore I will encourage people to learn how to use & carry guns so they won't be stabbed to death by criminals the way my son was.' But that's just me."

Me, too. (But her son didn't die. He recovered.)