Statins have a clear impact in reducing cholesterol levels and boosting BigPharma profits, whether you think either of those are 'a good thing' is a very controversial subject. There is no hard evidence that proves that reducing cholesterol reduces CVD. (Plenty of threads elsewhere on that subject, no need to pursue it again here

).
Your last sentence says everything of course. Truly independent drugs research is very rare for obvious reasons.
This gives some idea on the costs to the NHS of diabetes
http://www.diabetes.org.uk/Documents/Diabetes UK Cost of Diabetes Report.pdf
If you find anything in there that says "It's the carbs stupid" please let me know.