A lot of "inner-city" blacks don't feel this in their gut. Remember they spend their entire day where they are the overwhelming majority, The "race-war" enthusiasts also might be counting on their being a more cohesive group than the white majority, and more willing to use violence.
A small force with high willingness to fight can prevail over a larger group with a lower cohesiveness and lower individual willingness to fight. Just ask the Israelis about their experiences in 1967 and 1973