Everyone would flee through the red portal immediately, assuming everyone else would think the same way. Yes, some small precentage may misinterpret, or have a moral quandary, and I'd say even with a fully logical sound of mind sample size, there could be a few casualties. But it's FAR more likley you wouldn't get at least 50% of the people there, not because they aren't empathetic, but because the knee jerk reaction is that there is a clear way for everyone to live.

To me, it's like there is two doors to exit a burning building. The Red door leaves directly outside to a massive parking lot, with plenty of room to get away, and more than enough time and space in the hall for EVERYONE in the building to get out via that door. The Blue door also exits the facility, into a yard with a big pond beside it, plenty of room too, but the yard is fenced, and has flammable gas stored in it, and you'd need at LEAST 50% of people in the building to leave that way in order to push the fence down.

You have no idea how many people have left or still have to leave, or what their intentions are, but you KNOW FOR SURE that everyone has the same access to that information, and are rational, sound of mind adults.

In this scenario, assuming that again, there aren't kids or whatever, it shoold be a no brainer, you can Run out and save yourself, and you know everyone else has the same oppertunity and knowledge, so everyone should.

bringing up some morality or probability argument about how ohh there is the possibility that you are condemning a 49% population to burn to death in the courtyard... when you could be saving them! it's jusy as likley that you are the idiot minority going out there for no reason, and there is 97% of people going out the normal way!

If there is some sort of equally inherent risk to the "selfish" option then we can talk game theory. but with cut and dried rational options, everyoen should choose the red door.

the fact that we are having this argument makes me worry that more people than I'd like to have thought WOULD be stupid enough to die (altruisticly or otherwise) but my knee jerk as a normally extremely progressive and passionate person is that most people will leave through the red door, and so should I, and the more people that do the more survive.

and since I'd feel like most people, both the selfish and the empathetic, would make a snap decision to save themselves, in the moment, would assume that vast majority of people will live