To add to this discussion note that there does not need to be actual danger but as you indicate he needs to be able to articulate what brought him up to his choice to use the firearm in Self Defense.
BigDave hit the nail on the head. In this state, according to the law we are pretty well protected. You don't HAVE to be in grave danger of bodily harm, you only have to BELIEVE you are.
As to the test of "reasonableness", the jury is supposed to look at from the perspective of the person at the time it
happened. Not from an "after the fact, with all the information, and interview transcript of what the suspect's intent was" perspective.
If the old man had made it clear he was giving handouts, the guy continued to pester him, acted aggressively, possibly making verbal threats, then reached in to the truck either through the window or a door and tried to start taking things by force. It is very reasonable for the old man to be in fear, and therefore justified legally in his response.
The news articles are woefully short on information. A lot of the dimwits making comments on the news sites focus on
what was being taken - a cell phone and wallet. That is not the issue, the issue is
HOW it was being taken.
If I pick up your cell phone out of the grocery cart while you back is turned, that is THEFT and a misdemeanor (unless the value of property is over $750). You would have no reasonable fear of being injured, and if you turned around as I took it, absent any threatening acts on my part you would be hard pressed to make a case for shooting me.
The minute force is used such as physically taking the property from another person (struggling over it, trying to yank out of my hand, etc.) or threat of force such as
"You better give it up old man or else!" it becomes ROBBERY. Robbery starts as a class B felony and goes up from the there. The value of what is being taken is irrelevant, it is the manner in which the criminal acts.
I could be carrying a bag of dog crap to the garbage can, you might think it was gold nuggets, threaten me and then struggle to take it away and at that point under our state's law, lethal force becomes an option if I think I may be seriously hurt.
Age and disparity of size may become an issue, but it isn't cut and dry. I am 47 years old, in reasonable condition, but am considerably overweight as well as having recurring back, neck, and shoulder problems from previous injuries. I am in no condition to scrap hand to hand like the good ole days when I was in the Marine Corps. At the time I get into any physical altercation with anyone short of a frail considerably older than I person, I am going to be seriously concerned about being seriously injured.
I hope at some point we get the WHOLE story. I also hope the old man sticks to his guns (assuming it is legit) and doesn't feel pressured into pleading down to something under threat of prosecution, has his day in court and is vindicated.
As far as people who prey on others, I think it is time for society to stop being so lenient. The criminals are getting WAY too many "second chances" and very few are learning from those chances or changing their ways.
If the government doesn't do something about it, and sooner rather than later, more and more people are going to be pushed into feeling they have to do it themselves. Then we will have real problems.