Can someone explain why it's illegal to brandish a gun on my property when a bad guy won't leave?

Recent comments on reddit spoke about two jerks who refused to get off someone's doorstep. people said brandishing would be a quick trip to jail.i fail to see the logic behind making that illegal, on my own property. yes don't be brandishing in the middle of starbucks, but at my house? when random pricks are trying to start shit, or even threatening me?why can't i pull my gun and say gtfo of here? via /r/CCW http://ift.tt/29pvScT