Do you think a teacher should carry a gun in order to protect the students in the school ?

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After many shooting and many people got killed in USA, A suggestion finally comes up saying that it is is good to train a teacher and arm him with a gun in the school in order to protect the students in case if any shooting or killing happens in the school. I think there are always pros and cons for everything especially in this case. Pros : 1. At least someone at the school can stand against the attacker when situation happens. 2. The students may feel more secure since there is someone already with a gun in the school can protect them. Cons : 1. It make s the teacher who carry a gun suffer from more work load pressure. 2. the teacher may encounter legal issue if he can't do this job well when terrible situation occurs. What do you think ? Share with us ?