Let's play hypothetical and say the people who are at risk are less than 1% then who is the selfish group? Less than 0.1%? Does that number ever cause you to

Let's play hypothetical and say the people who are at risk are less than 1% then who is the selfish group? Less than 0.1%? Does that number ever cause you to switch positions or at an arbitrarily small number would the rest of the world be selfish to not get a medical intervention on their behalf?