> This has all the same hallmarks of the original problem.
No, it doesn't. It introduces a bunch of political baggage that doesn't fit, for no reason other than so that you can talk about political groups you don't like.
> If the targeted group is less than 50% of the population then they need people who are not in the targeted group to vote blue to stay alive long-term.
There are no "groups" in the thought experiment (except the ones defined by the choice), and nobody is being "targeted". No "vilification" occurs, and crucially anyone in the "blue group" can trivially just not be so (unlike the identity markers that you're clearly trying to allude to).
> There will always be people who "just vote for themselves" since the immediate payout is obvious. Hopefully there will also be enough people who collaborate and vote blue despite that obvious/immediate payout to avoid genocide.
Survival is not a "payout", and no "genocide" occurs in the case that blue voters fail to attain a majority. You say "hopefully", and you load the situation by describing evil politics. But in the actually described experiment, as an objective matter of fact, there is no meaningful difference between a world where 51% voted blue and a world where 100% voted red.
> One could even say that voting red is cowardly in this scenario.
One could say this, but ordinary tests of courage do not expect people to risk their own lives for no benefit beyond the possibility of contributing to saving people who don't need saving (as they can trivially save themselves.
> As usual, the devil is always in the details.
Things that you add to the situation, or read into it, are not "details".