I've watched it. In fact one of my tama's parents are about to leave in a few minutes. I don't see how it's sad. It's just life. A lot of mammals leave their young after they're born.
It is really sad. I hate watching it because it's sad but I never can seem to go to bed when I know they are going to be leaving. It's like an addiction lol..I always have to watch it. Actually, I have one leaving right now