…a circle holding hand and singing about death and the man trys to get them to stop.

1970 or 80’s  on the television sci-fi where a man with a beard is walking with a woman who is showing him this future world. He sees children going around in a circle holding hands and singing positively about death. The man tries to get them to stop and the woman gets involved and explains to him that it is okay and that it’s what they believe. You could see the frustration on his face not understanding why the people of this world would believe or teach the children that death was good.

Everyone spoke the english language.

I think the man might have been in a tan robe-like garment.