The first idiot was teaching a gun safety class.....which should not be taught in a HS classroom. Yes, he should be fired and the administration that approved the curriculum should have consequences.
The second idiot's situation is being investigated, but he should be fired. The guns should ONLY be drawn on school grounds by an officer or trained individual in a situation to protect children from harm. Otherwise the guns should be hidden and locked away. Any violation of this should result in immediate dismissal.