Oh jeez, I think that Ragna easily could've tipped over to the dark side. Her mom was/is a hero and probably has high ranks in the army, which put a lot of pressure on Ragna to follow in her footsteps. She wanted to, tried and failed and got really bitter about it.
She could probably have gone all "screw this" and just joined some space bandits to spite everyone. But she decided to frelance as a bounty hunter instead. Sure, she calls herself a lone wolf, she might be greedy with getting the cred, and sure, she's not the friendliest of the bunch. But something with turning into a life of crime still doesn't sound like an awesome deal to her =)
If she turned bad however and became a bandit with a bounty on her head, I think Gav would be devastated. He'd probably try and talk her out of it and be so disappointed. The rest of team SPEJS would probably feel betrayed, but also feel the need to collect the bounty (we made it happen, and now we must stop it, kind of).