Certainly, the world is an uncertain place. If you are naïve, the real world will swallow you up. Many criminals are willing to see the Border Patrol Agent dead just because he or she is wearing a uniform or just because they think its fun to kill people. Some people wear their intentions on more than just their sleeve.
Before the Agent can take action there must be a:
Threat on life or grievous bodily injury on yourself, a third party or a fellow agent.
And then the bad guy must have the actual ability to create that threat.
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