Ultimate attribution error
Explains the negative behaviors of out-group(others) to personality defects and negative behaviors of the in-group(us) to external circumstances or chance. Fundamental Attribution Error at group level.
It is most likely to happen to individuals who possess negative prejudices and stereotypes toward an out-group.
This attribution is considered a root of prejudice, as people who commit this attribution will usually see members of other races, religions, cultures, or even social class as inferior or flawed.