The truth behind the tush push: Tinkering with the rules in sports is necessary — and good

The NFL hasn’t outlawed the tush push. Yet. The league’s rules committee ran out the clock Tuesday on deciding the future of the specialized quarterback sneak, also known as the Brotherly Shove for being popularized (and perfected) by the Super Bowl champion Eagles. Its detractors say it’s dangerous or boring — or both. The Eagles...