[Entreri21]

Tomato, yes Sinestro was a former GL, but he basically twisted the values and ethics of the Corps to suit his own needs, and after that was basically shunned on his home world as a sort of fascist. There was a running storyline in the new Corps book that was about another member of his race being picked to be a Lantern, but not wanting it because she felt that the Corps was to blame for Sinestro being an evil bitch...