Making it mathematically simple for everyone.
This perspective is valid so long as you assume that its highly statistically improbable for Red to get 100% of votes, which is obviously true.
Everyone on earth takes a private vote by pressing a red or blue button. If more than 50% of people press the blue button, everyone survives. If less than 50% of people press the blue button, only people who pressed the red button survive. Which button would you press? BE HONEST.