As I could view his question in, "Would you defend Liberal Democracy if the Nazis were invading"? As an example.
And then the answer is yes, I would be.
The thing is, in a lot of cases, violence ISN'T needed and one can be won via the pen, not the sword. A good person avoids violence as much as he can, but if it's needed, then he defends himself and others against people that'd do evil. If the Rwandian genocide is occurring and you can prevent it by knocking out the perpetrators using military action, you are morally obliged to use military action, not sit here and let people be slaughtered like animals.
You'll find though a lot of people though are pretty inconsistent when they start screaming about violence, they'll go berserk over a guy sprouting off offensive rhetoric, but ignore the fact the previous government was bombing innocent men, woman and children. As often the people calling for violence are the most emotionally inflicted with their views...
Honestly one of the last things I want to do before my die is have a butcher make me a delicious steak out of my hams and have a chef expertly cook it up. I'd love to taste human before I die. I'd offer it to all my friends too, maybe even guilt them into it as a dying wish.