Have they studied the evidence? Do they care about scientific truth? No. They want to maintain a way of life and they see modern findings that contradict tradition as a threat. Truth has nothing to do with it.
Do the enforcers of conventional views on race truly believe that each race is equally talented at everything? Not necessarily. They do believe, however, that the common people need to believe this. Are the ADL and the SPLC and the MSM interested in objectively viewing the evidence on the significance of race? No. They want to maintain a certain approach to life where all groups are viewed as having equal capabilities.
Why do people believe or pretend to believe something so stupid? For the same reason that addicts believe that they have a disease that is not their fault. Because of the consequences of this thinking.
People who deviate from the racial orthodoxy must be destroyed — according to the upholders of the conventional morality — because they threaten the fabric of the modern multi-cultural multi-racial West and might bring about genocide.