Yes, nagas are evil, I never tried to justify them. All I'm saying is that Illidan tries not to use them for evil. He commands and army of evil but not to do evil. Nagas were bitch ass high elves that drained some mana source or whatever it was (I can't remember) and they sank afterwards but remained douches. While nagas actions are wrong, I see nothing bad done by the blood elves. They were wronged by the humans so they just left. And as I said earlier, I am not trying to justify nagas, or any of the races, but Illidan. So, he awoke a group of "terrorists" but who knows exactly what he wants to do with them. He saw them as wronged Night elves, so he probably wants to lead them to redemption, as he leads himself to redemption (because that is one of his "missions", he always tried to prove himself - to his Bro, to Tyrande, to the world, that he isn't a worthless piece of shit (thus, the power hunger) although he always failed).
On your third point - Yes Illidan does both good and bad actions, here we agree. But what I'm trying to say is that he always did them with good or neutral intentions (good being helping other races, etc. ; neutral being helping himself (power hunger)). He isn't neutral by any means, you could say both Evil and Good, but neutral? Ones such as the Archmage could be described as neutral. Illidan does have evil in him, but for a reason - Brother betrayed him, 10k years in prison, hated by all of his race when he only wanted to help, failing every time when he tries to do something good, etc. I can say that he manages to keep his evil closed very well, considering all of the above. Unlike piece of shit Arthas who broke so easily due to power hunger and so on.
Now, Tyrande helped them yes, but I am unsure whether Furion would have helped them. Perhaps he would have, but he is quite an ass, always following the law, old rules, and probably the old hate for High Elves still remains.. who knows.
Oh I didn't count in his acts to do something good for Tyrande since I think that even a villain would help her if he loves her. I was trying to point out him helping people he doesn't know, cuz that is true good, the other could be turned into doing something for your own good. But also, yea, I forgot that one.
No, because I can point out Humans doing just fine, being good guys - the ones lead by Jaina. Lord Garithos has no excuse to be an ass.
Actually he tried to walk away, as we can see, in Outland. And btw he didn't really make a pact, he was forced. If KJ appears before you, you either make a pact or die. Cuz if he had not made that pact he would have been dead. At least now he's alive, able to do something about it. And he tried. It's not like to say he totally gave up like Arthas and succumbed to evil. He was just pushed to evil. If Furion had not been an ass and accepted him, he would have been fine.
Nine. I doubt tyrande and furion gave a shit about Maiev, nobody cares about her xD. I think he could have killed her if he had stopped to fight her, but I guess you are right here, he was on the run, had no time for fights.