Selfish? I don’t think so.
The blue-button pushers are imposing an obligation on everyone else: They are needlessly placing themselves in harm's way and counting on enough other people making a risky gamble to save them. This becomes more obvious if you word the question slightly differently: If you press the red button, you live, but if you press the blue button, you die unless 51 percent of people press the blue button.
Exact same scenario.
But one would need logic and reasoning skills to process it.
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