Lol as if whether or not they could make a cure was even the biggest problem of that post hoc bullshit.

How do you mass produce it?

How do you redistribute it?

It does jack and shit, once you're already mutated.

What fucking difference does it make, when the biggest problem isn't becoming a zombie, it's either getting mauled to death by one or getting shot by a bandit.

Since the Fireflies are amoral assholes, we know they would have just use the cure to oppress the population.

Oh and considering they broke the deal, stole his shit and wanted to throw him out into the zombie infested hellhole without even so much as a knife or ration, Joel was entirely justified in murdering the shit out of all of them, instead of letting them kill a kid, after barely doing any testing.