RBBB but those who can't vote are at the voter's mercy. Majority red = everyone who didn't press red dies. Representation is not allowed.

Same ol' red button or blue button question, but I want to consider this situation a little more "realistically".

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Everyone on Earth is asked to head to their nearest government office within the next week to enter a room alone and are asked to either press the red button or the blue button. No information is released from any government entity about whether this is real or a prank, but the global coordination seems odd, and rumors/leaks are all over the place, and you're not sure what's actually credible. The scenario is posed as follows:

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If the majority of those who voted pressed blue, nothing happens. But if the majority pressed red, then everyone who didn't press red will be executed. This includes everyone who is unable to vote, such as babies, those in comas, etc etc. The details of how this execution might happen isn't shared, but you can already see some of your neighbors arming themselves in anticipation of some sort of violent conflict.

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There is no ban on discussion, but some people are understandably cagey when asked how they voted. How would you vote in this situation? Would you vote right away? Would you wait until the last second? Supposing red does win, and the majority of non red voters are actually hunted down and executed, what would the world look like? What if blue wins? Would there be "witch hunts" for red voters, or would everyone assume the whole thing was some sort of elaborate globally coordinated joke?

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I'm curious to see what people think of this thought experiment in a more realistic scenario like this. Also if you have anything to add, please share below!