Thats fair enough. Professional athletes live a more complicated life. Half of sports players even millionaires are flat BROKE after after retirement. I'm sure thats several times more a likelihood than the average person. Then there's excessive drugs and alcohol and all kinds of exotic substances in the body for physical training. Then athletes tend to be pretty strong minded and bullheaded "Don't take sh**" types. . There's even the approach of playing THROUGH injury. They can apply that to life. They'll probably think they're on top of the life game when theyre NOT Something about them just "aint right" in general. Though you said there's basically NO DIRECT effect of brain illness to any increased rate of suicide. Putting almost the FULL brunt of the causation on lifestyle choices and environmental factors. I do think the "6x more likely" might be some exaggeration. Like its turning football players into suicide machines. But the head injuries just HAVE to trigger some of those "underlying" effects more. The amount of that is debatable, but its gotta be more than ZERO.