Because the best defense is an aggressive one.
Much has been written, said, and debated regarding external safeties on handguns. Designers, manufacturers, and end state users have been proponents of the various forms of external safeties over the decades and that would tend to lend credence to their necessity. But, maybe those folks are wrong.
Much has been bantered about regarding the various “castle doctrines” and related laws. Much of what is out there is just that, out there. Many states have adopted some form of “castle” or “stand your ground” laws as they relate to use of deadly force in defense of one’s person, home or property.