It's not an invasion of our rights. You voluntarily chose to go to football games which are high-value targets for terrorism. The NFL has an obligation to enforce some type of security protocol and this is what they want to do. God forbid a bomb were to go off in a crowded stadium you know the first thing everyone would be asking is "How did we let this happen?" and "How come there wasn't more security?"
first of all, it is absolutely an invasion of my rights. I am allowed to bring cameras into sporting events(depending on lens size etc) however, now its going to be a huge pain in the ass to bring a camera in. I'll either have to wear it on my shoulder for the whole time I am there, or put it in a damn fucking clear gallon bag, which offers no security for me, and no protection for the camera, versus putting my camera in a nondescript bag that doesnt scream HEY THIS GUY HAS A CAMERA!
This is just one example.
Secondly, have you been to an NFL game recently? They already search ALL BAGS, and they do pat downs at every gate to every person entering the event. Which I'm fine with, its a minimal thing that doesnt take long and doesnt inconvenience me. This process never takes too long and they keep the lines moving so there is no excuse that it slows everyone down.
NFL stadiums are high risk low reward, people are too spread out, you would have to get a huge as bomb in to do any real damage.
And finally, if you are that afraid of life, maybe you need to just stay inside.