This is a very interesting read, but I was hoping to see a mention about another very common thread among those suffering from depression, ADHD, anxiety, drug addiction, etc. - that is the use of mood altering drugs as a means of treatment. When a TV commercial spends 90% of the air time explaining the side effects (many of which are suicidal thoughts) and 10% of the time about what the product is supposed to do, you realize that big pharmaceutical companies are spending fortunes on advertising. That may be a reason why news reports never mention that virtually all of the mass shootings, the suicidal Lufthansa pilot, and scores of other tragedies involve the use of these drugs on people who appear to be more likely to commit acts against themselves or others. It also applies to many of our veterans, who are committing suicide at alarming rates.
That aside, we should strive to reduce the risks from concussions through safer equipment, but if you turn the game into flag football, then it loses a lot of its luster.