. . . How can I (or anyone else) sincerely hear the message when I am so suspicious of the messenger?
You shouldn't. But on the other hand, a bad messenger doesn't necessarily mean a bad message. Given that he's apparently falsified bills, I wouldn't take RH's word on anything, but he's far from the only doctor who believes diabetes is a largely self-imposed condition resulting from a diet high in sugars and grains. Chelation, on the other hand, has fewer supporters even among independent-minded docs, and I'd be very skeptical of any data generated by RH. But there is plenty of fraud in conventional medicine. Check the book Doctoring Data by Malcolm Kendrick, MD, for example, on how unreliable even major studies published by top medical journals can be. Or, if you have just 30 minutes to spare, watch MD/Phd. Beatrice Golumb's great presentation "Drugs Harms Versus Benefits, The Impact of Conflict of Interest":
[video=youtube;SZHyLODgUvs]https://www.youtube.com/watch?v=SZHyLODgUvs[/video].
The upshot is that the only way to know what a medical study says is to read the full study yourself, and even that won't catch falsified data (such as eliminating adverse events by claiming the affected patients withdrew from the study).