Sex offenders cut across all population groups. They come from all walks of life, whether they were born here in the U.S. or crossed
la frontera from the other side without the proper documents.
Stranger rape always make the news more than acquaintance rape does, even though the latter is more common. People are more likely to be rape by people from the same cultural and racial background. Whenever there is a crossover, it is usually white men raping women of color.
Read Lawrence A. Greenfeld's
"Sex Offenses and Offenders: An Analysis of Data on Rape and Sexual Assault." He is a professional statistican from the US Bureau of Justice Statistics. I'll copy and paste the relevant information to support my argument, but you should take a moment to study the data he mapped out:
Imprisoned violent sex offenders were more likely to have been male and white than other violent offenders (table 2). Offenders serving time for sexual assault, in contrast to those incarcerated for rape, were substantially more likely to be white, and they were nearly 3 years older, on average, at the time of their arrest for the offense. While about half of incarcerated rapists were white, about 3 out of 4 prisoners serving time for sexual assault were white.
As for general homicide, you can also look at Shannan M. Catalano's "National Crime Victimization Survey: Criminal Victimization, 2004," which can be found
here under the "Sexual Violence" topic. The first couple pages articulate that the FBI reported a total of 16,500 murders or nonnegligent manslaughters, and based on the data they collected and interpreted, they came up with this:
When the race of the murder victim was known, about half were white (49%), and about half were black (49%). About 3% of murder victims were of another race... Homicide is generally intraracial.
Not all undocumented immigrants are sociopaths (antisocial is the more appropriate term here) and murderers. As a matter of fact, sociopaths only comprise roughly 3% of the general human male population, according to the DSM-IV (Diagnostic and Statistical Manual of Mental Disorders, fourth version.)