I think the last line says it all:
"There are so many people that are mad because anyone that knew Jeston knew that he would never, ever try to harm anybody," Clisch said. "He was not that person at all."
That's just it, the guy in the apartment DIDN'T know him. He didn't know he was a great guy or that he had three kids to take care of. All he knew, or needed to know, was that there was a strange, young, bald headed, goateed freak, who was under the influence of something, in his apartment. I am not an old man but in the same situation I too may fear that I was about to face great bodily harm or death.
We all make our choices in life and have to deal with the consequences. It's sad but this young man choose to drink his mind into oblivion and paid the ultimate price.
Bronson