Press red and you might kill.

The people who chose blue in no way contributed to the peril you are in, thus you aren't justified in killing them in self defense.

I meant:

Choosing blue is choosing to most likely kill yourself.

To me, the whole point of the riddle is that it reveals the most internal bias towards either yourself or others, meaning that you do things for society or for yourself. Blues don't understand reds, reds don't understand blues. The bias is invisible to the self but it is clearly there given the huge contrast in the opinions of people.

You fail to see how anyone could choose blue, even though there are plenty of people on the internet and even in the comments here who are stating they would choose blue?

> I fail to see how anyone could choose blue

Depends on the scenario… or the number of people in the experiment. A sufficiently large number of people will guarantee votes in both bins. The specific scenario (reading this outside of a vacuum) will also have knock-on effects.

Eg: reading this into the current political landscape in the US vs reading this into another toy problem about jumping off a cliff or not will have very different outcomes and ethics.

Practically at least one person will choose blue for lulz or curiosity or as a moral compass. Shall we punish them? How does it affect survival of whole population in a long term?