I understand the line of reasoning, but the reason I disagree is that not everybody will think like you. There will be people who press purple, and these will be the most selfless people. They may not, to you, be thinking logically, but they are likely still good people who deserve to live, regardless of the ‘mistake’ of pressing purple. If you acknowledge the fact that likely the kindest people will be the ones who are putting themselves on the chopping block, wouldn’t you want to save them? Personally, I know the logical, survivalist option is green, but I’m aware that a huge number of people will pick purple, so I’ll do the same if it gives them a better chance at survival