Quote 1
"So, it'd be easy for you? Using that on people?" I ask.
"I didn't say that." Gale drops the bow to his side. "But if I'd had a weapon that could've stopped what I saw happen in Twelve... if I'd had a weapon that could have kept you out of the arena... I'd have used it." (5.58-59)
Here, the text seems to be asking whether it's <em>ever</em> OK to kill other people or to use such "a weapon" on someone else. Gale tries to explain that, in some situations, any weapon ought to be allowed, to protect the ones he loves from a terrifying alternative, like going to the arena.
Quote 2
"I doubt they'll ask for details. They saw it [District 12] burn. They'll mostly be worried about how you're handling it." Gale touches my cheek. "Like I am."
I press my face against his hand for a moment. "I'll survive." (2.12-13)
In moments like this one, it's hard to tell if Gale and Katniss are just friends, or if they're something more. The way Gale touches Katniss and the way she responds both seem to suggest that they draw some kind of comfort from being physically close – and might even be craving that closeness.
Quote 3
"I wonder how she'll make up her mind."
"Oh, that I do know." I can just catch Gale's last words through the layer of fur. "Katniss will pick whoever she thinks she can't survive without." (23.89-90)
In the next chapter, we find out that this statement really hurts Katniss's feelings. Outside of that, though, it's hard not to wonder if it's true. Every decision Katniss has made up to this point, not just in <em>Mockingjay</em> but in all the books, has related to survival: her survival and the survival of the people she really cares about.