It's more likely that you will kill yourself in a car accident, so ban cars. Your arguments about protecting yourself from yourself are weak as water---WEAK AS WATER!As a private citizen you're more likely to accidentally kill yourself then to perform a justifiable homicide:
https://www.statista.com/statistics/251894/number-of-justifiable-homicides-in-the-us/
https://injepijournal.biomedcentral.com/articles/10.1186/s40621-019-0220-0