Comment: For those that think that the old guy was the aggressor

you need to understand what really happened. The old guy started with the collar grab and threat but he stopped and retreated (but we don't know what happened before the collar grab, so this is only a guess that the old guy started it). But he did retreat! The reporter followed and badgered the old guy. Then grabbed the door to enter. The reporter trespassed on private property where he was not welcome or invited and was aggressively attempting to enter the building. The reporter became the aggressor and the old guy became the defender at that point. He had every right to defend himself and his property from an aggressive person actively violating those rights. Violence was his last recorse at this point since the reported was commiting violence to him by his willful trespass.