Although defending oneself against bullies, terrorism, or any other type of aggression may result in your injury, principles are more important than health.
Bullies only win when their victims refuse to defend themselves.
Perseverance in the face of overwhelming obstacles leads to victory. Our country was built on this ideal and draws its strength from it. Pacifism leads to slavery. Whenever you give up that force, you are ruined. Allowing terrorism to dictate your actions is abdicating liberty for security.