https://www.gunsamerica.com/blog/9-c...-7-truck-guns/
Basic points:
1. Have rifle to join in the fight if there is a major critical incident. Case in point, the Texas Tower and civilian rifle usage. If you don't join it - you are a bad person despite the risks. You couldn't live with yourself if you didn't join the fight.
As a psychologist - I don't know what that statement means. We can treat all kinds of psychological trauma nowadays. You can't live with being dead. Now the ethics of not joining in the fight are complex. Classic internet insult and flame fest. The line is a throw away posturing one in my opinion from a treatment point of view.
2. The Kel-tec SU-16 is a great truck gun. Perhaps, but I saw one crack in half at the start of curve of the pistol grip in a carbine class.