The NFL does not care about player safety, they only care about money. If they do something about safety it is in response to an issue, but once that issue moves out of the news cycle, the NFL moves on.
Not exactly true - they care about player safety as much as is minimally required to continue to grow business and profits. So they care about player safety, just not the individual humans that are those players.
Once the NFL reached billion dollar status, the machine was in motion and players became cogs in that profit machine. They are numbers and the focus of the league is to keep as many of those numbers (players) in play and generating the profit.
So the nfl cares about player safety, just not people safety.
People are replaceable and thus irrelevant to the goals of the machine.