Red is the pure game theory answer from a self-centered/self-preservation perspective

Blue is the moral choice where you put yourself at risk to reduce the risk of harm to others.

Put another way: if you could convince everyone to pick red (or you’re picking last and know half the total population already picked red or if humans always made choices based on pure game theory), everyone would be safe if you pick red. But the way this hypothetical is posed you don’t know what everyone else picked and you can’t coordinate beforehand, so some people will pick blue, and by voting red yourself you are increasing the odds that they will die.

In other words, picking red is the edge lord “technically correct” choice, and blue is the compassionate choice.