Can A Security Guard Use Weapons To Kill For Self-Protection?

It is important that every security personnel have the ability to protect themselves because danger is not a farce.
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‎The teaching clarifies that killing someone during self-defense is not seen or taken as murder, because it was not deliberate but was needed for protection.
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‎But this does not give us the right to behave carelessly.
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‎The focus should be on preventing the damage not being the first to attack.
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‎It would be better to disarm the person coming to attack, for example, for protection you can aim a shot at an area where it would not kill him.
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‎This teaching stresses on being wise, responsible and cautious.
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‎The instruction is obvious: practice self defense when necessary but in cautious and disciplined manner, depending solely on God's direction and your skill.
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‎Being safe and wise is very important.Amen.