My biggest issue by far is how embedded football is into our public school system. They are essentially feeder leagues for the NFL that the public pays to operate. We glorify the sport to little kids and then shove them into the head trauma pipeline.
We should absolutely not be a party to that at the public level. I'm aware of the issues with drawing a line on dangerous sports, but I'm sure something a ton of people can agree on is that wherever the line ends up, football is on the wrong side of it. It's position is relative to the line.