So this is funny. I never saw the final scene of the How Long video because i am button happy and have always turned it off too fast.
I saw it the other day and was like HOLY shit. Those last few seconds change the possible interpretations DRASTICALly.
We wound up, those of us who live here, having a spirited discussion about it, the sort of discussion you would find in a college ethics course, re the protagonist's justification or lack thereof .