I don't know about ruining the game, but there are other source skills that are pretty nice. Also, nothing in the game is so cut and dry as good or evil. I think the trick is finding the balance of play that suits you. You can probably go full evil, and leave nothing in your wake, or remain as lawful as possible, but you'll still probably end up as lawful neutral at best, but I'm still not sure who makes the laws since you start out in chains. The only way I could see that working is if you never removed your source collar.
