Are the Fireflies a Good Thing?

I think the first episode that explicitly said the fireflies might be bad like we had heard Joel not believing in their bullshit or whatever he said right. I didn't really take those as the show saying anything about the fireflies yet at that point because it's like maybe Joel's going to be turned around by the end you know like. But this episode. Ellie's belief during the flashback is that they're they're killing innocent people. They're terrorists basically now now she's obviously changed her mind to some degree by this point in the show but still goes along with Marlene's mission. She has no pun intended book one under desk and she's reading a savage starlight comic. The