On top of all that has been said, it really bothers me the cheap appeal to emotions, by killing grandma. How is that relevant to the subject of the video? Or is it just a token to appeal to tears? How would have the message been different if both grandparents were there, still 'loyal' to the organization?
When you know your argument is weak, it's time to appeal to emotions.
Sad thing is at assemblies most will fail to see the hypocrisy, and will march saying "best convention ever!"