https://www.citylab.com/equity/2017/12/telling-the-truth-about-crime-in-americas-cities/548930/
Bottom line, one can’t make some blanket statements about the crime rate in this country. If crime is increasing/decreasing in a certain location, to paint it as attributable to illegal immigrants rather than a myriad of other factors is overly simplistic and sensationalized.
If one wants to delve into crime data, here’s a good place to start:
https://www.brennancenter.org/publication/crime-trends1990-2016