If you look at the timing of most the laws against specific types of knives… you’re going to notice a pattern where there was some scare involving some minority or alt group.
Switch blades were outlaws after Hollywood depicted African American villains as gangsters with them.
Same with ballisongs and Asian gangsters/villians.
All of that said, auto-openers have a hair trigger and I would suggest instead getting a good flipper you can easily flick open. Benchmade bugout is my EDC (not for fighting, it’s light and solid.)