lashing out
I think a large part of the reason people lash out is because of an understanding that they are angry, but a failure to understand why.
Your job was taken away and the infrastructure around you is falling apart? Just blame immigrants.
Angry at your partner and don’t know why? Maybe they’ve been leaving the toilet seat up, and you know it bothers you, but you just don't understand just how much it bothers you and it builds until you yell at them about something unrelated.