I don't think the Azure can be removed, its nature is to consume everything around, including the weilder and ya know..I wonder if Ragna would bleed out if it was removed, isn't it the only reason he was even able to survive getting his arm cut off in the first place? Then again, he lost his left arm with no problems soooo.
But yea, as much shit as Ragna gets, its mostly his own fault; even he acknowledged that he just kinda accepted the power of the Azure without even understanding the nature of it or trying to, he just wanted it for the sake of destroying everything that pissed him off. And he's a self righteous asshole who tends to put his foot in his mouth.
I still love him, but yea...he's not completely devoid of fault when it comes to his misfortunes.