Nah pretty much everyone picks red if it was a real scenario. It's also bizarre to call everyone picking red a sociopath because they don't want to gamble their life on some naive and idealistic view of humans.
Believe what you want, the numbers disagree with you. As for the sociopath label, assuming psychopathy and sociopathy are the same thing, egocentrism and impaired empathy are central traits.
It was a pool in X where people that press blue were not going to die. They just lied to feel better.
Try again with money, everyone puts $1000 so it's real but nobody dies. Red pushers get their money back, everyone if >50% press blue. I like my version where 10% have miss wired buttons, so the % of people that will vote "incorrectly" is inside the model. Send the lost money to an Khmer Rouge advocacy group so nobody feels good about losing the money.