10% have diabetes, but a fraction of that have type I. Type I is due to autoimmune destruction of the pancreatic islet cells - the cells that make insulin. Type II is due to insulin resistance, with a large number due to obesity.
For many if not most people with type two diabetes, it is completely controlled by a difficult to do but simple to understand change in diet and exercise. Most have a choice of doing that or a lifetime on drugs and poor health. After the way that our medical community has mishandled Covid, I would not be surprised if there were many doctors who preferred keeping people on drugs and in poor health.
Aren’t like 30% of Americans overweight, ergo more Type 2 diabetics?