There's no correlation between immigration of any kind and increased rape and violent crimes.
http://www.researchgate.net/publicat...at_Perspective
http://www.pewresearch.org/fact-tank...ey-assimilate/
And to clarify the second link before someone misunderstands my statement in lieu of the link please note that there is an increase of crime between first and second generation immigrants but even then it remains lower and in instances the same as natural born citizens.