Note: Despite the video going for 10 minutes, only the first 5 minutes is about this topic.
I think the grounds for the reason are pretty sound. The player is dead or alive, or they win or lose. Everyone knows the fundamentals and since it's so familiar everyone can get behind it, so to speak. I thought the brief psychological analysis was very interesting too.
It also seems that most games that don't have killing in them need to be familiar in a different way, and often just recreate boring everyday tasks like farmville or fast food franchises. These get kids to grow carrots or make burgers for fun.
I'm hard pressed to count more than a few games I've played without any sense of lives or win/lose scenario other than the games ending. Flower is one of them and Journey (not played it yet, waiting for it on PS4) was mentioned in the video. I suppose the old point and click games weren't kill/die either, nor very win/lose in terms of levels, but about the journey the game took you on.
Something to think about, at the least.
What do you think?