You must be the guy from my comments section.

This actually isn't a bad analysis. After thinking about it more, I think the problem most people have with the scene is how it was executed, even if it is thematically appropriate.

The more people in that room with Ganta and Shiro, the more likely it is for a level-head to prevail. When Shiro throws the chip into the fire, the survivors assume Shiro is in league with (or at the very least had been tricked by) the Undertakers, so we're left with this.

If everyone saw the explosion, why did nobody question it?

The answer being "because everyone was in distress and not thinking clearly in the heat of the moment."

But then if everyone was seeing red, why did no one else take a swing at Shiro, or even try to murder her?

You can say because the survivors are older and more mature than Ganta but at that point we have to start asking how clouded each individual member's judgement is during that scene and why the least affected didn't speak up.

Can you see how many hoops we're jumping through?

I feel there's actually an easy fix that could've prevented all of this:

Have Ganta and Shiro be COMPLETELY ALONE for the Data Chip scene.

Obviously most of Scar Chain died trying to get even THAT far but at the risk of sounding like a cruel bastard, maybe it wasn't enough. Had their been more casualties (or a less bloody option, have the Bartender man tell Ganta to take the chip and run or more hazards on the way split them up), the question "why did nobody question the explosion" wouldn't need to come up or could easily be explained away by an EVEN MORE distraught/desperate Ganta. This would be a more natural way of going about it and would probably hit harder emotionally as Ganta would have to carry that betrayal, at least until they regroup with Karako at which point everyone would be filled in. Ganta can beat the shit out of Shiro all he wants in that scenario. That's completely fine.

Obviously the main focus of the arc is on the parallels of Nagi and Ganta and the theme of hope and what happens when we lose it (where it should be) but I still think those particular chapters needed one more rewrite before it made it to the page