Metta World Peace elbows Harden

In a friendly game of basketball between the Oklahoma City Thunder and the Los Angelos Lakers, Metta World Peace delivers a huge elbow to James Harden after World Peace finished his dunk.  Metta World Peace (Formerly known as Ron Artest) has been in trouble with the NBA before for acts of violence and had his name legally changed to reflect he was a changed man.  Now, from what I see, this was no accident.  He clearly was celebrating his dunk, and then accidentally ran into Harden.  No big deal to begin with, then World Peace decides to throw a nasty elbow to make it into a big situation.  World Peace was suspended for 7 games which doesn't seem like much of a shock to anyone.  I know that basketball can be a contact sport, but when it gets out of hand there should be some sort of punishment to prevent it from further occurring.