I don't think it's "odd", in the same way tobacco companies were so reluctant to admit that their product, if used the way it was designed to be used, can greatly contribute to someone's death. That would mean that they knew that their product was detrimental to their customer's health and chose to fight the public finding out about it rather than offer compensation. The tobacco companies definitely knew as far back as the 1930s that smoking kills, but it was not in their best interest to alert the public to that fact. To a degree, the same could be said for any contact sport. For decades, the owners' primary focus on putting a good product out on the field and there wasn't a large enough time frame to make the connection between concussions and brain death. Now we know definitely that there is a direct and unmistakable connection between repeated blows to the head and long term brain health. The NFL has known about this for almost two decades and is only now coming around to the fact that taking care of the former players is not only good for the former players, but also good PR. Good PR is priceless when you're trying to recruit new customers (i.e. younger athletes and their parents).