Paul Green being found to have suffered from a severe case of CTE does not necessarily mean that it caused his suicide, and I find the willingness of people to jump to the conclusion that it did to be quite a dangerous precedent.
That's not to say that it wasn't a, the main, or only, factor, or to say that it's impossible that brain damage as bad as this could be enough in of itself to push somebody to do such a thing. However correlation doesn't equal causation, and it'd take significantly more evidence than that that has been provided to support such a claim.
I think it's more than safe to say that CTE plays absolutely no part in the vast majority of suicides, and to negate other possible factors in such a publicised case would be a mistake. It's an especially bad idea when considering that many people are only doing so because it's a convenient thing to blame, or simply because some people find it emotionally distressing to believe that other potential factors could have played a significant part in his decision making.
I'm genuinely sorry if anybody finds this post upsetting, but unfortunately hard subjects like this need to be discussed in a frank, even cold, manner sometimes.