The dad (spoilers)

He's stupid for keeping a hunting rifle in the house. doesn't he know his son runs a big risk of shooting himself after seeing the scars on his arm, his suicide attempt and the unfiltered diagnosis made by his psychiatrist? He loves his son but it's beyond me how he missed all those signs. I could have given it 8/10 but due to the father's stupid and reckless behavior this movie doesn't make it above 5.