Great topic, and a tough decision for parents of any child who has interest in playing. Like many previous posters, I played tackle football from middle school through my senior year of high school. I wish I could have played in college, but it was either go to a DIII school to play or go to the U for academics and science programs I was most interested in (I picked the U, and the continuing football dream died). I sustained only a few minor lower leg injuries throughout my career, and was a starter both ways every year I played. Nothing even remotely close to a concussion. So my experiences in youth football were overwhelmingly positive.
Fast forward 20 years. My son hit 5th grade and was interested in playing, but not overly so. His mother was a little reticent, but I decided to encourage him to take it seriously and see how he liked it. 2 years later, and its been a terrific decision for him, physically, socially, and developmentally. He had a bit of a culture shock his first summer of conditioning practices, but stuck with it, and ended up being his teams starting right guard, and found himself really loving the responsibilities of blocking for his friends in the backfield. He had a great year, made new friends, increased his personal confidence, and played well.
The next season, he built off that foundation, and began to get really passionate about playing. He started talking about being accountable for his responsibilities on the line, and started to develop a real pride in his assignments. By mid-year he was made a captain, and took that seriously, developing some burgeoning leadership qualities as well. He's now been through 2 full seasons, and never missed a snap on offense, and gotten into the mix on defense every game as well. Its been wonderful watching him grow and develop. I hope he continues on this trajectory, as it is helping to make him a well-rounded kid.
Yes, there is the specter of injury that looms over every game and practice. A few of his teammates have been held out of games per their very stringent concussion protocol. But the kids are continuously taught how to tackle properly, and the coaches have to attend clinics on concussion education and best teaching practices to prevent brain injury. I'm not naive to think my son can be totally protected by proactive coaching and injury protocols. I know the risk is there. But his growth and development in the sport and as a young man are worth that risk to me. If he ever felt that he didn't want to play because he was worried about injury, of course I would support his decision to step away.