Today's NFL players know more about the effects of violent hits than their predecessors did. They know that hits to the head can destroy or damage the brain. They know that former NFL players struggle with everything from dementia to sore backs.
Today's NFL players belong to a brotherhood of elite athletes, and a union that pleads for the league to care more about their well-being.
No matter. Today's NFL players spend Sundays trying to fold their brethren like origami.
They level each other with vicious blind-side hits. They aim at each other's heads, and use their own helmets as weapons. They show even less regard for their opponents than they do for themselves.
They risk their health for their teammates and families, to pay their bills and sate their bloodlust. This week, I asked three generations of hard-hitting NFL defensive backs whether they ever felt empathy for their opponents, either in the split-second before collision or in the moments after leaving a player writhing on the turf.
In a word, each said, "No."
Vikings coach Leslie Frazier starred for the famous 1985 Bears defense before a knee injury ended his career. Vikings cornerback Antoine Winfield, who weighs about 185 pounds, is one of the best tacklers in recent league history. Harrison Smith, the team's first-round draft pick out of Notre Dame, is starting at safety as a rookie.
All three come across as smart, classy and unapologetically ruthless.