Was Sora justified in killing the Organisation members?

[Clawsze]

Axel became his ally,

I seem to remember that Axel went to Kairi first, and kidnapped her before Saix stole her from him.

But he only kidnapped Kairi so he could try to get Sora/Roxas to meet him, to try to get Roxas to rejoin, as he missed him.
IMHO Org XIII had a good reason to be...Org XIII, but like most people, they went the wrong way about it. I think some deserved to die while others just...well...you get the point.

Deserved it: Xemnas (Good idea, bad execution and a warped idea)

Xigbar (Turned a holy dragon into a demon, nuf said)

Xaldin (EVIL SIDEBURNS OF DOOOOOOM!!!!)

Saix (Too loyal to Xemnas)

Luxord (Revived Zombies for a game basically)

Marluxia (Tried to be a Xemnas, failed miserably. Nice hair though ¬_¬)

Larxene (Sadistic bitch, with a kinky name)

Depends: Vexen (Helped Sora, but that was to further his research, whether that was good or bad...)

Leaxeus (Not enough screentime to judge really)

Zexion (Seemed loyal to Org XIII, but never really seemed...evil)

Demyx (The whole mood-swing in Radiant Gardens puts him in doubt, whether the whole "Silence Traitor" was his true attitude, or a facade to scare Sora)

Didn't deserve it: Axel (For obvious reasons, but he might of survived if not for the...(SPOILER)Kamikaze)

Roxas (Technically the only member to survive, albeit in Sora's heart)