There is a fundamental reason why the white man fears the black man, and that is the often the perception by whites that the black man can hurt him. Of course, the question then becomes as to why the white man would have that sort of perception, and certainly it has a lot to do with the fact that unlike the American Indian, which the white man essentially eviscerated and marginalized in such a way that the American Indian, will almost certainly never rise again in America, the black race was not eradicated but instead was freed from slavery. Then, despite political efforts by those in authority, of returning the black man back to Africa or re-settling them in Central America or similar, the black man in response showed little interest in those ideas but insisted that their adopted country, the country that they were born into, the nation that they shed their blood upon, was their country too, and essentially asked only that they have a place at the table, and in return accepted the promissory note due to them.
Unfortunately, since the liberation of the black race given by the Emancipation Proclamation, the black man received, in many instances, far less than what was deserving to him, and consequently, lived in a land that offered them far less liberty, far less justice, far less happiness, and far less prosperity. That these things have been denied the black man simply because of the color of his skin, or to a certain extent based on his former status of perpetual servitude, is a great sin across this nation. The thing that the white man recognizes all too well is that God's justice does not slumber forever and he rightly fears God's retribution, while projecting wrongly that fear onto the black man. What the man white fails to recognize is that the sword of avenging justice will not come from the black man's hand, it cannot be, but only from He who is righteous judgment, itself.
Having said that, the righteous hand of God's justice can be stayed, by taking actions that mitigate and rectify previous bad behavior, as even the right behavior of a few can save an entire city, as well as an entire country. The frustration that any man can feel, stems often from injustices and opportunities denied, and should these things be amended to in any satisfactory way, the accompanying results are quite beneficial for all.
The black man asked the question many years ago, "am I not a man and a brother," and to this question the only satisfactory answer is yes. When the white man believes in their collective hearts that the answer is yes, and must be yes, then the fear that so many white men have of their black brothers will lift as if a fog lifting from a early spring day into the bright sunshine of a better day and a renewal of that vow and self-evident truth that indeed all men are created equal and endowed by their Creator with specific unalienable rights.