It depends on what you determine to be "good." The NCR basically created the Powder Ganger threat by bringing a whole slew of criminals into the Mojave, but you could view turning them into the NCR as helping to fix that mistake. Or, if you feel bad about how the NCR basically wholesale slaughtered the Khans at Bitter Springs, let them join the Khans so they may have a better future of survival.
I've since ditched that play-through, as I got disillusioned with the NCR before I made it to the very ending.
On my House play-through, since the Khans are leaving, I put the powder gangers in their ranks, so they can leave with the Khans.