Kind of like the legendary tale of the Manhattan liberal who bewailed the election of Reagan (Or Bush, depending on which version of the story you hear) that she 'Couldn't believe he really won honestly because nobody SHE knew voted for him,' there is a similar kind of mindset in the lower and stupider strata of the urban Black community from which the NBP draws its membership: They see Black people all the time, everywhere, every day, and do not actually understand what proportion of the population they really constitute. They honestly think there are more Black people than White ones in the US, and believe a smaller White minority population is keeping their 'Majority' economically oppressed and powerless, like the Sunnis in Iraq did to the Shi'ites.
There are two consequences of this:
1. If they try anything, they'll get their asses blown off in a heartbeat.
2. Since they are basing their plans on wildly-wrong assumptions and insanely-vitriolic racial hatred, they are a lot more likely to try to do crazy things than a rational person with accurate information would be.