A weakness of deviation from social norms?

It changes with time, raises the issue of hindsight bais. Homosexulity was considered a mental illness until 1973, resulting in institution but now its considered normal. Means that historically the reliance on the defintion of social deviation could have led to violations of human rights where people were deemed abnormal To diagnose peopel on these grounds is a form of social control over minoirty groups to exclude those who couldn't conform.