Supposedly to protect the players....especially the cry baby Brady. Eventually its going to turn all football into a sissy powder puff game. Some rules however keep the game going at a reasonable pace like eliminating ridiculous end zone dances and such...so some rules are necessary. The red flag issue is a great idea especially since some refs need re educated before every season.
The rules and regulations in football give the game an organized outlook. These rules also enhance the competitive aspect, because reported fouls add or reduce points indirectly for the participating teams.