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No one can be completely certain of the survival setting you will find yourself in. Still, it will be hard to avoid hostility after a certain point. What you will come to realize is that as people get desperate, they will come for what is yours. Now I am a firm believer in the idea of deterrents. I think the deterrent is the most important part of interacting with violent or desperate people.
This article looks to cover what happens when you have a serious decision to make. When that decision becomes a matter of life and death you must be ready to fight. I really like the angle of remembering our humble beginnings here in America and that we are a vicious and gnarly bunch who push the crown out and created the greatest nation on the planet.