mrustow, thanks for the links. Horowitz appears to get his data from the links below, a report issued a few years ago.
Aristeides, you can find detailed statistics here Color of Crime-PDF file
Color of Crime-HTML Cached copy
Using your example of Rape/Sexual assault, for 1999:
White Victims 313,080100
78.4% White Perp (245,454)
10.1% black perp (31,621), remainder unknown
Black Victims 53,670
10.1% white perp (5,420)
83.5% (44,814) black perp, remainder unknown
A white victim is as likely to be attacked by a black (10.1%) as a black victim by a white (10.1%). From that perspective, the racial fear factor appears to be the same.
However, there are 37, 041 cross racial rapes, of which 85% were black on white crimes. And of the 76,435 rapes committed by blacks (about 25% of the total), 41% were cross racial, compared to only 3% for white rapists. Race would appear to be a factor. The stats appear to be similar for other categories.