How come Dwayne Wade or Lebron James has never gotten into a fight in the NBA?

I have never seen them fight before. Every superstar in the 1980's and 1990, at least got into one fight. Larry Bird got into a few. Micheal Jordan fought Reggie Miller. Charles Barkley fought Bill Laimbeer; hell, even John Stockton got into a fight,. Is Lebron James and Dwayne Wade, soft? Do they wear tampons?