I lived in this town, and I think this particular neighborhood, until two years ago. (A lot of small side streets, I may have the street name confused.)
It has one of the lowest crime rates of any town of similar size in the entire country. I believe it was 3 years ago, it was rated fifth safest, two years before that, second or third.
I lived there for 15 years. In that time, I had my front door egged once on halloween when I ran out of candy, and once, some kid stole a water sprinkler from my front yard. (It was a pretty funky sprinkler, I understand the attraction. LOL)
There is no evidence that there has been any problems with vandalism. I don't buy the pent up anger argument.
It really appears to me that someone really over reacted.
A death over some junk in a car, or a car radio, is pretty tragic.
That someone will undoubtedly go to jail adds to the tragedy.
Please learn your local gun laws.
The need to retreat is very clearly delineated in NY law. I realize other parts of the country may have different rules on this, and the arguments either way can be very powerful.
The law is the law however. Just because you think it should be different doesn't mean you are going to get off.