Unfortunately we will always have people who can not discuss peacefully and tend to use physical aggression to get the other person to agree with this person's ideology.

That is why in these cases it is necessary that the other person also use physical aggression to stop the attack of the other person. So I am totally in favor of any kind of defense instrument, whether it be a knife or a .50. We have the right and obligation to immobilize anyone who attempts to attack us physically.