I don't undrstand how people say red is the "logical" option, because it doesn't seem to be, in my opinion.
Depending on what outcome you desire of course, if you want to make sure YOU survive then of course the red button (unless you trust blue will win), but everyone is trying to make sure that most people can survive, and in that case the blue button is the most logical.
In a case where discussion isn't available the best to do is vote blue, because not everyone will vote red, that's just a fact, and so we can expect that most people will vote blue, because humans care for eachother like that.
And in a case where discussion IS available the best option is STILL to vote blue, because again, not everyone will vote red, and now with the certainty that the majority will vote blue we have even MORE of a percentage going to blue, meaning definitely more than 50%, meaning a 100% survival rate.
People WILL die if red wins, and people WILL survive if blue wins.
I think it's very simple.