Which one of the following is NOT an early indicator of a potential insider threat? (Antiterrorism Scenario Training, Page 3)

Abnormal mood swings, depression, and suicidal remarks

Presence of unauthorized weapons

Aggression or threats toward co-workers

A reasonable disagreement with a US Government policy

the following is an early indicator of a potential insider threat:

Abnormal mood swings, depression, and suicidal remarks

Presence of unauthorized weapons

Aggression or threats toward co-workers

so the one that is NOT an early indicator of a potential insider threat is

A reasonable disagreement with a US Government policy

I believe the answer is: A reasonable disagreement with a US Government policy

An insider threat is the source of threat that could compromise national security which come from inside the country.

Reasonable argument would most likely lead to a respectable debate between two opposing views, so it is not malicious enough to be considered as a national threat.