I think if they showed a video were everyone panicked and shouted "We're all going to die" it would probably make passengers, some of which could already be nervous about flying, terrified.
Their videos show the ideal situation and how to calmly address an emergency. Panicking doesn't help you do anything so they want to try and represent a calm collected response in the hopes people will emulate it. 'Course I usually just get airline attendants explaining the safety measures and no video and they looked more absolutely bored then calm. (imagine explaining the safety rules multiple times a day for years... terrifying)
Their videos show the ideal situation and how to calmly address an emergency. Panicking doesn't help you do anything so they want to try and represent a calm collected response in the hopes people will emulate it. 'Course I usually just get airline attendants explaining the safety measures and no video and they looked more absolutely bored then calm. (imagine explaining the safety rules multiple times a day for years... terrifying)