Spyderco are probably chosen because they look " weird".
A weird knife will lead to stronger negative reactions towards knife ownership.
They would never use a standard kitchen knife, because most people would react by thinking " hey i got the same one in my kitchen drawer, but i am not a criminal"?
So they use an unusual, even "ugly" looking knife. The sheeple will think that only someone with sinister intent would buy a knife with a serrated edge.