[mikem170]

> In a democracy of three, two people can vote to kill the third.

It depends on the specific rules of their democracy.

Majority democracy would allow the majority to kill the minority, as in your example. I heard this goes back to Roman legions, who knew that the 51% could kill the 49% if it came to battle.

Democracy by consent would not allow for that, because that third person would (presumably) not consent to being killed. This requires that people respect each other enough not to impose on minorities.