If people are going to continue to attempt to draw conclusions from reactions taken after a huge traumatic event, I suggest you read the following:
http://www.apa.org/helpcenter/recovering-disasters.aspx
PTSD isn't just for the military.
I do not think people are drawing conclusions because of someone's response to a trajedy. They are speculating to try and make sense of this trajedy. As stated on the link you gave there is no standard reaction. It is not going too far to suggest IF's biological mother and his father's girlfriend did not like each other. The question posed is how bad were these feelings before Leila was murdered.
How do people respond differently over time?
It is important for you to realize that there is not one "standard" pattern of reaction to the extreme stress of traumatic experiences. Some people respond immediately, while others have delayed reactions — sometimes months or even years later. Some have adverse effects for a long period of time, while others recover rather quickly.
And reactions can change over time. Some who have suffered from trauma are energized initially by the event to help them with the challenge of coping, only to later become discouraged or depressed.
A number of factors tend to affect the length of time required for recovery, including:
The degree of intensity and loss. Events that last longer and pose a greater threat, and where loss of life or substantial loss of property is involved, often take longer to resolve.A person's general ability to cope with emotionally challenging situations. Individuals who have handled other difficult, stressful circumstances well may find it easier to cope with the trauma.Other stressful events preceding the traumatic experience. Individuals faced with other emotionally challenging situations, such as serious health problems or family-related difficulties, may have more intense reactions to the new stressful event and need more time to recover.
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