Hey Moron, maybe stop using YouTube as an emergency instruction service…

Valve was founded in 1996 by former Microsoft employees Gabe Newell and Mike Harrington.

You have no idea how this works.

You are confusing taking a class with actually having ethics. No amount of attending a lecture about ethics will convince you if you do not, as a basic premise agree with the ethical principle that loss of life is a bad thing. And to be very clear, ethical principles are subjective. There is no objectively right or wrong thing as far nature is concerned.