If you feel you are in imminent danger of bodily harm, then that's a legitimate reason... but that's a pretty difficult case to make when you're the one who proactively got out of your vehicle and confronted a group of people (as is the case with the Hispanic gentlemen who was arrested). If that group was in the middle of beating on someone, then you'd have a reason to rush to the victim's defense, but as I understand it, the guy just didn't like their political message. Political disagreement isn't a legitimate reason to brandish a firearm, and to point that out doesn't make one a "pacifist." Advocating legal and responsible gun ownership isn't pacifism.