I think this hypothetical captures a sort of hero complex. You think everyone is too stupid to choose the right choice so you will save us all...

Except we all chose red because its the obvious choice and now you are dead.

The only option that leads to a statistical chance of murder though is red.

The framing leads many people to pick blue for its altruistic framing. Enough, in fact, that 50% quorum is honestly not difficult. A lot of red-advocates seem to have a False Consensus Effect going where they're convinced way more people than in reality will interpret this "dilemma" as "do you step in the human grinder in hopes of jamming it", and act accordingly.

A 70% or 90% requirement, or just explicitly framing it as "do you step into the human grinder" would make it vastly easier to aim for 100% red, but we're dealing with the literal words of the "everyone lives button" here.