If you consider this a moral issue, you may ask "What would Jesus do"? I think of it more as gambling issue, so I'd ask "What would Tony do"? Can you imagine how that live chat would go?:

Me: May I speak to Tony please?
Tony :How can I help you?
Me: Why has my arena bet on Arizona canceled?
Tony: Obvious bad line.
Me: Obvious?
Tony: Very.
Tony: Correct line is 12 not 2
Me: Arizona was -2 at all my other Books, so it was not an error.
Tony: You think 2 is a fair line for an 11-2 team at home?
Tony: Versus a sub .500 team?
Tony: You took a shot.
Me: No I didn't. It's a small market event, so a larger line variance is to be expected.
Tony: 10 point variance?
Me: Justin7 and other respected SBR forum members think AZ-2 is a fair bet.
Tony: I could care less what the forums say.
Tony: Anything else?
Me: Yes, you can reinstate my AZ-2 bet.
Tony: No can do.
Tony: But I can disable your account if you persist with this nonsense.
Me: Never mind
Tony: Good. Take another shot and your account will be closed.
Tony: Now get off my live chat.