I heard about this incident when I was in Florida in January. It happened to someone I've known for years. I don't see them much anymore, but we still keep in touch.
They have a 30-year-old son who still lives at home. He had some learning disabilities growing up, but nevertheless managed to graduate from high school. He went to community college, took some photography courses, culinary courses, health classes. Meanwhile he worked on and off, mostly at restaurants.
Last year he started to exhibit some mental-health issues. At one point, he got into an argument with some other young men -- nothing physical, just verbal -- and he decided that these guys were coming after him for revenge. Whenever a car came down the street he would peer out the windows, wondering if someone was casing out the house.
At first his parents were wary, on the lookout. But nothing happened. There was nobody. So the parents tried to downplay the whole thing. But the son couldn't let it go and seemed to be getting more paranoid as time went on. He stayed at home more and more, afraid to go out, because he thought people were following him.
His parents arranged for him to get some therapy. He was prescribed some medications. He took them most of the time, but complained they made him sleepy and lethargic, so he occasionally skipped his doses.
Then one day, he woke up in the middle of the night. He thought he heard noises somewhere in the kitchen or living room. He convinced himself that someone had broken into the house. He panicked. He thought intruders had come to attack his family; but he was too afraid to go out of his room. Then he decided they were after him, going to kill him. So he decided to do it first.
He had some kind of knife in his room, and he started to cut himself on his arms. He bloodied himself but didn't do any major damage. Then he stopped. He smoked a cigarette in an attempt to calm himself down.
Next thing he knew, his mattress was smoking. Apparently, he had dropped his lit cigarette on the bed. And now it was on fire.
His dad woke up -- maybe from the noise his son was making, maybe from smelling the smoke. He got out of bed, quickly checked around the house. It was dark and empty. There were no intruders. Then he saw the smoke coming out of his son's room.
The dad got his son out, along with the rest of the family. He called 911. The fire department showed up in a few minutes. The fire was mostly contained in the son's bedroom, but between the fire damage, the smoke damage and the water damage, the house was a complete mess.
The family suffered some smoke inhalation, and some emotional trauma. But no one was burned; everyone's okay. But they had to find someplace else to stay for the time being, and wait for the insurance company to assess the damage and then begin the long process of repairing the house.
The son was sent to a mental-health facility where he spent a few weeks undergoing more intensive therapy. He understood what he had done, and was remorseful, but also knew that he couldn't always control himself.
Now he's back out, living not with his family but in an apartment in a home. He is still under the care of a psychologist, with more careful monitoring. The family is in the process of putting their lives back together, which has only been delayed by the Covid-19 epidemic. But the prognosis is good, for both the young man and the larger family.
Fortunately, there was no gun in the house. What do you suppose might have happened if there was?