Often the use of weapons is not always a positive. You can be over taken and it could be used on you.
A while back a teacher of self defense was over powered and harmed. There is no "right or wrong" its just not the world that many of us grew up in. Even tho these things happen, I still talk to strangers, enjoy learning about the joys of the world, and how we are alike. That is how we should be.
I guess where I hear of the real negatives of death from distraught family members, its a big deal, that "one" out of a million people that have done the same thing and not getting out of it safely.