Chronic traumatic encephalopathy, informally known as American Football Disease, is a condition caused by repeated minor concussions, and results in the brain stretching and tearing. Psychologically, people suffering from this disease are 6 times more likely to commit suicide. Memory loss, early dementia and depression are all associated with the disease. Due to these psychologically problems, victims have an average life expectancy of under 60 years (far below the American male average of 76.9 -- (https://en.wikipedia.org/wiki/List_of_countries_by_life_expectancy)) (https://www.youtube.com/watch?v=otN0qb8Srrw).
If NFL is thoroughly damaging to humans, and alternative sports are readily available (of which are less injurious and quasi-fatal), then why should this be preferred?