All depends on the situation at hand. Sometimes I will keep it from ever coming up and if it does, change the convo. Then after they've been hanging out with me for a while, tactfully let them know I am carrying and "see, I never tried to kill you." A lot of times that will help sway them. Or take them shooting and show them how it isn't the gun that kills someone, it is the person and intent. Most people fear what the do not understand so if you can make them understand, they may not want to carry but at least they aren't as afraid.