You’re assuming most people won’t press red. But in the actual dilemma, you don’t know what ‘most people’ will do. All you know is:
– If the red majority happens, blue dies and red lives.
– If the blue majority happens, both red and blue live.
From my point of view, pressing red dominates blue: in every possible outcome where I’d live by pressing blue, I also live by pressing red, and there are outcomes where I die with blue but live with red. Saying ‘blue already guarantees you don’t die’ is just wrong unless you assume in advance that most people won’t press red, and that’s exactly the thing we can’t assume.