I appreciate that they wanted to have at least one person exposed to the virus and be removed, after all, what kind of apocalypse is this if there’s no actual danger. I wish it hadn’t been Michael and Amber (late arrival, early departure) but I understand why it happened.
What I don’t understand is why everyone else is still all gung ho to go to the fishing shack. They’ve been attacked, and kidnapped, but no deadly virus. Now they’re all eager to leave the attacks to go somewhere where half of the scouting party “died”. Does that really make sense?