Despite the downvotes you’ve received, you are correct. The under-reporting of crime among illegal immigrant communities for the reason you identify has been studied and documented:
Since most victims of violent crime know their attacker [0], this may imply an under-reporting of crime committed by members of the undocumented community as well.
https://www.iza.org/publications/dp/10306/silence-of-the-inn...
Since most victims of violent crime know their attacker [0], this may imply an under-reporting of crime committed by members of the undocumented community as well.
[0] https://www.zocalopublicsquare.org/2016/08/06/americans-most...