Is ethnic hatred always wrong and bad?

Is it bad and wrong to hate an entire ethnic group or groups if throughout one’s life all incidences of personal abuse or witnessing abuse were caused by abusers that share the same ethnicity?

Or, how about hating entire ethnic groups based on the comparative rate of abuse where the incidences of personal abuse and witnesses of abuse were much more prominent among other ethnic groups than one’s own?

If you happen to answer yes, then the follow up question is how can it be bad and wrong if hating an entire ethnic group has been proven to be beneficial for the victim who has been abused? When I say beneficial, I mean to say that discrimination and avoidance of the entire ethnic group or groups has diminished the incidences of personal abuse or witnessing the abuse in the victims life.