Zechariah was watching from the side while Ike and Irine argued. However, he decided now to intervene before they went too far. Even if they didn't start getting physical with the fight or anything, they couldn't risk more tensions within the group itself right now. It was bad enough that they were on bad terms with the humans already.
"Alright, that's enough, both of you." He looked at Irine first and addressed her. "Irine, I know that you have your own values, and I respect that. But, at this point in the mission, you have to remember that we're a very small group against the world. You wanted to get this mission done quickly and simply, right? Well, there's no point in making that more difficult by antagonizing anyone - whether it's in our own group or outside of it. By no means should you abandon your own standards, but perhaps we should try to stick on as best of terms as possible with the humans and other peoples here. You don't have to lie or mislead them, but let them know that we are on their side and mean no harm. That wouldn't be lying, would it?"
Then, to Ike.
"Ike, I wasn't there for what occurred. But from what it sounds like, it was a mess from both sides, and the blame should not fall totally on Irine. At a point where we were on our own and weak, and the humans were also pretty shaken up from our screw-up with the explosion, I believe that it's unfair to say that one or the other was responsible."
"I know that we all have our differences and, well, we might not get along very well. Still, when we're already weakened and uncertain of where we stand in this world, it doesn't help us to fight over each other, or with other people. We all want to succeed for one reason or another. Let that be your focus. You are either totally separated and easy to destroy, or united and able to complement each others' strengths."
Opt to wait until we're either rested and ready to go or until the others decide it's time to move.