I think in the beginning he was just a punk kid who was too smart for his own good. The fact that he did NOT have strong loyalties to the IRA was what attracted the Brits to him in the first place. They used a few different techniques to get him to join, but he resisted.
His first motivation is money. They gave him a car. Of course to us it seems like a crappy car, but in Belfast in the 80's, that was probably a fairly nice vehicle, especially to someone who probably was a long way away from ever owning his own car. He probably also feels smart because he's pulling one over on the IRA.
As the movie evolves, you see him grow and change. He sees the IRA torturing and blowing up people and he decides to "save lives" in exchange for some money. I think he also develops a strong bond with his handler Fergus, who provides him with a father figure that he's probably been lacking.
Eventually, he falls in love and has a child of his own. Speaking from experience, this is something that can dramatically change your perspective on many things in life. He probably wants to get out altogether, but as they told him when he pledged his allegiance to them, once you're in, there's no getting out.
The most touching bit (whether you agree with what he did or not) is that he traded his life for the lives of his family. He'll be hunted as long as he's living because as you might have picked up on some of the other posts on this board, the IRA has a long memory.
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