Who Bears the Guilt
I'm a red button pusher. But honestly, that's not even the important thing here. Lets say, this scenario did actually happen. That this WAS something everyone on the planet had to do.
HOW.
Think about it. If every single person on the planet was required to press one of these two buttons, someone or something is responsible for that. Someone or something is killing people if blue gets less than 51% of the votes. Is it immoral to make the entire planet play this game? Is it immoral to kill people for pressing a button? YES. A hostile government, psychopath, supervillain, alien entity, eldritch horror, trickster god, take your damn pick, something is making the planet play this game. THEY are the ones responsible for killing people here. Not red button pushers. Not blue button pushers. The entity.
Yeah, I do think that the most likely outcome is that some people are going to die. I do not believe that in a life or death scenario, that 51% or more or people are pushing blue. The public talk is performance. Even me, we all are performing something, but I think blue button choosers are performing both moral superiority, and prioritization of the herd. Humans are a social species. Right now, you are viewed poorly for prioritizing your own life over potentially saving everyone. It costs nothing to say on the internet, I would choose to be a hero.
But in a scenario where, there is a cosmic entity, hostile government, or full blown diety playing games with the lives of everyone on the planet, to put the burden of morality on the forced participants of the game, is ridiculous. If this was a real thing presented to me, I wouldn't even know if I would believe the terms. But, in the interest of simplicity, I will assume that I do believe the terms. I'm just not fucking with my own life. At the end of the day, I prioritize my own survival above everything else. Especially since humanity has harmed me over and over again in my life, but I still think it wouldn't matter if it hadn't. Not to mention, in this scenario, if I die, it will be because blue FAILED. I wouldn't have even saved anyone. I would have died for nothing.
So I'm voting red. And I'm blaming whatever terrible being who made humanity play this game for killing innocent people.