When it comes to safeguarding yourself, you do not always wish to come at someone with a lethal amount of force. Sometimes you simply wish to make sure that you are able to escape, call the cops, and live to see another day.
Sometimes, deadly products can end in your death, when an assailant finds that you are being reluctant and turns your own weapon on yourself.
Picking a non-lethal technique is likewise going to be legal in more places, guaranteeing that you are always protected also. Watch on your security and make the best option.