What is a frustration-aggression hypothesis?
The frustration-aggression hypothesis states that aggression is a result of frustration. Frustration is any event or stimulus that prevents an individual from attaining a goal and it’s accompanying reinforcement quality (Dollard & Miller, 1939).
To read more about the causes of frustration and all other good topics I'll recommend that you visit: https://www.simplypsychology.org/frustration-aggression-hypothesis.html
That should give you more detailed information.