Siege mentality: Part I

Definitions of "siege mentality".

From google:
"a defensive or paranoid attitude based on the belief that others are hostile towards one."

Cambridge dictionary:
"a feeling that makes you frightened of people around you, and causes you not to trust them."

Collins dictionary:
"If a group of people have a siege mentality, they think that other people are constantly trying to harm or defeat them, and so they care only about protecting themselves."

Macmillan dictionary:
"the belief among a group of people that everyone else is in opposition to them and they must protect themselves"

Merriam-Webster dictionary:
"a defensive or overly fearful attitude."

From dictionary.com website:
"state of mind whereby one believes that one is being constantly attacked, oppressed, or isolated."

Longman dictionary:
"the feeling among a group of people that they are surrounded by enemies and must do everything they can to protect themselves."

From Wikipedia:
Siege mentality is a shared feeling of victimization and defensiveness—a term derived from the actual experience of military defences of real sieges. It is a collective state of mind in which a group of people believe themselves constantly attacked, oppressed, or isolated in the face of the negative intentions of the rest of the world. Although a group phenomenon, the term describes both the emotions and thoughts of the group as a whole, and as individuals.
The result is a state of being overly fearful of surrounding peoples, and an intractably defensive attitude.