I don't like Two-spear very much, but still... I can't blame him. I always saw Two-Spear as an elf driven by his wolfblood more than like a crazy elf. I don't think he is actually, he is just too wild. when I read his story, I can't stop thinking about Timorn's fight between his two alves, elfsong and wolfsong. I think Two-Spear fought too.
Furthermore, I think Two-Spear suffered the same ill than the elves we call the "dark ones" or the "Shadows" as Elfmom says. All the elves trying to control, manipulate AND protect others, without asking what they think about it. Akhen, Winwowill, Rayek, Kahvi, Surge, etc. Two-Spear merely looked for a way to protect his tribemates from Humans. He did it with his own language, violence, but still he wanted to protect.
Like a Wolf... And you can't reproach a wolf his behaviour. It is its nature.