…and BOOM! Godwin.
Except they aren’t like Nazi concentration camp guards. They already rescued your whole party. They haven’t robbed or enslaved or executed any of your people. Even putting you out of their compound, they are leaving you in a much better position than when they found you i.e. you were about to be devoured. Can you give any examples of Nazis doing anything like this for any of the groups they slaughtered?
Are the impure race people being sent out into near-certain death, or not?
If they’re healed up, and sent on their way, and will be fine because zombies aren’t really dangerous if you take proper precautions, then that’s one thing. If that’s the case, there’s no point to the hypothetical. The hypothetical is only interesting if the people being cast out have very little chance of survival on their own.
If they wanted the race they consider inferior dead, they could simply have stood back and let the zombies finish what they had started. They could also, in a lawless world, simply kill them with impunity. They have not done those things. Is refusing to take them in murder? How many homeless and vagrants have you murdered, then, because you didn’t take them in?
Well, as long as you agree that some racists are benign. 
Seriously, though, jumping to the concentration camp comparison is just hyperbole. We’re not locking up and killing these people - we’re putting them back in the exact same situation they were in before.
I can’t see this as any different than walking by a homeless person and giving them a dollar. I haven’t actually helped them, have I? I’ve given them a small temporary benefit that otherwise leaves them in the same disadvantaged position they were in before. So shame on me for giving homeless people a dollar when I could give them a room in my house.
Now, we could add permutations to the original scenario that might shift my opinion one way or the other, but until these racists are locking up, enslaving, torturing or killing people, they’re just not on the same scale as concentration camp guards.
Imagine you, and you’re dear companions, are prancing along. You’re thirsty. You spot a little brook. You put your little dear lips down to the cool, clear water - BAM. A fuckin’ zombie rips off part of your friend’s head. His brains are lying on the ground in little bloody pieces. Now I ask ya, would you give a shit what kind of social standards the son-of-a-bitch who shot the zombies was adhering to?
Your rescuers did not have to save your group. They did not have to share their medical supplies with your group. The did not have to share their food. But they chose to.
If they ask you to leave, you’re no better, or worse, off than you were before the zombie attack.
It’s Skald’s story, but let me suggest this:
During the crisis of rescue, all the rescuers saw was people and zombies. Maybe none of them like seeing people eaten by zombies. Maybe they were the more liberal members of the group. Maybe they just saw you and your kids at first, made the decision to go in, and took the larger group in during the heat of the moment.
BUT, after seeing to everyone’s immediate needs, people get to talking. As badass competent as they are, resources are already stretched. “Why are we taking in these (puce-skins; triangle-heads; baldos; whatever) when we have our own to feed?” So the community leaders come by to give the bad news.
If they are not throwing you into the middle of a horde, it’s not certain death. At least not at their gates. It’s not as if your group hasn’t made it up until now. As was pointed out upthread, except for handing you this moral dilemma(and the disappointment about partial group rejection) they are leaving you off better than when they found you. If the group splits up, the rejected part will probably be worse off for smaller numbers.
I think it would come down to fear vs loyalties to family vs loyalties to the group. I’d like to be the ‘better man’, but I’d **really **want my family to be safe as possible. Even if I was alone, I could see being worn down enough by the running to want to stay.
On the other hand, while I only watched a couple of seasons of WD before I got bored, I was (for the most part) impressed by the development of the in-group loyalties, despite strong internal tensions.
Serious answer.
The way I see it, saving the lives of people they dislike is noble in a way.
Of course I’ll stay safely with them, and even stand by them when they help and let go the next group of ethnically different people.
I’d try to find out why they are racist though, it’d be a lot worse if they saw other ethnicities as zombie-lovin’ betrayers then if they saw potential multiculturalism as a threat to group unity. Racism is quite surprising when people should be banding together against the zombie “Other”
Joke answer.
Of course I’d stay with the Black panthers, but I’ll make my escape when I start to run low on
