Hey syrenn, gluten and casein are causing a lot of health problems in people. In fact, studies have shown that they especially increase symptoms in people with developmental disorders such as autism.
They also cause intestinal problems, amongst many others. 99% of people with gluten sensitivity don't even know that gluten is causing their symptoms.
As I'm sure you know, gluten is found in almost everything we eat, from bread, to pasta, to pizza, and most processed foods.
The New England Journal of Medicine has 55 diseases linked to gluten exposure, including osteoporosis, irritable bowel disease, inflammatory bowel disease, anemia, cancer, fatigue, canker sores, and rheumatoid arthritis, lupus, multiple sclerosis, and almost all other autoimmune diseases. Gluten is also linked to many psychiatric and neurological diseases, including anxiety, depression, schizophrenia, dementia, migraines, epilepsy, and neuropathy.
In light of this, it doesn't seem to make much sense to allow people to buy bread, cows milk products, barley, sandwich wraps, pizza, etc.
Basically, gluten and casein products are unhealthy and can not be trusted to be included in people's diets.