I think everyone, no matter where you fall on the issue here at hand, should also keep in mind that coming to the defense of a 3rd party is generally not an easy thing to do. Not just with your sensitivity regarding your opponents state, as sourceninja I think it was correctly noted, but being able to intercede without making things worse and/or harming the party you are attempting to shield from harm - that's a feat most of the time. When time is not on your side and your own father is paying the (iron)price, well I think those who are so quick to focus on the verbal part of this story are experiencing some unfortunate priority issues.
I am pretty curious as to what the old man attempted in order to reacquire his information, but I can say it speaks well to his standing that he didn't threaten anyone's life - supposedly acting to preserve lives, and then in defense of his own albeit not effectively.
On the other hand we have a bully threatening, then demonstrating, a desire to spill a senior citizen's blood over a car accident - adding that he would take the fight to pop's family as well.
I just have a hard time summoning up some blame or scorn for an father wanting to protect his family, or for him getting thumped ugly by a larger, younger opponent. Same for a guy who saw his dad on the receiving end of said thumping, and took steps to make that stop as soon as possible.
Someone attacks your family right in front of you it's make peace or make war time, not stand there like an idiot on the phone while your father gets beaten to death or has a heart attack/stroke.