You don't owe this company anything. The 'burning a bridge' argument is a null point in my book. If this company is that shady, what else are they doing?
Move on and don't look back if you want. Or blow the whistle. It's what you can live with that really oughta matter in the end.
Granted, I'm not adverse to burning a bridge if it keeps a pack of zombies on the other side of the river and away from the rest of the world. Granted, I'm the guy that basically called in repeated napalm strikes on a former employer as a part of a larger plan. Will that bite me in the ass someday? Maybe.. but it's a call I made and I don't regret it. I hear that the pilots at that company just got a great new contract. I wonder if the leverage the negative publicity provided might've helped? I think it might have.
Your call. Nobody would think less of you either way. Glad you got out before it got really twisted.