By Richard Horgan Los Angeles (Knewz) — It seems appropriate that the rating scale in a national survey about youth tackle football was a mirror image of the sport’s four downs. Just under 4,000 U.S. adults were asked to state their agreement with the statement, “Tackle football is an appropriate sport for kids to play.” The response choices were 1-2 for “strongly”-“somewhat disagree” and 3-4 for “somewhat”-“strongly agree.” Results were split right down the middle, overall, with 50 percent disagreeing with the statement and 50 percent agreeing. However, there were some big differences between…