Yahtzee is making a common mistake here by confusing polytheistic, lowercase gods with a monotheistic capital-G God.
In a polytheistic system, which is what most video games use, there are a variety of gods with limited power, especially over each other. "Becoming a god" is a reasonable life goal in this context, but the existing gods have a vested interest in keeping evil, selfish or destabilizing potential deities out of the pantheon, so it's also perfectly legitimate for them to conscript you to stop this from happening. It's like preventing ISIS from getting a seat on the UN Security Council: you can't fault them for trying, but you can't complain that James Bond was sent to stop them, either. Crucially, the afterlife is usually pretty depressing, so there is a big ethical incentive to stay alive, not kill people, etc.
In a monotheistic system, God has infinite power and wisdom, and is either a neutral-aligned embodiment of the universe or a Lawful Good interventionist deity. "Becoming God" in this context is something that only a bad guy would attempt, almost by definition, and any amount of force to keep that from happening is justified. The afterlife is usually great, but there are rules to discourage mass suicide.
The goldfish analogy is pretty apt here: imagine the universe as God's fish tank, where he has developed a sentimental attachment to us fish and occasionally reaches in to help us out. From the fish's perspective, his purposes are pretty much unknowable, but we can at least make a little happy dance in the water when the food is distributed to say thank you. The fish philosophers could reasonably conclude that the universe behaves in chaotic, random ways, but it isn't true.