When someone decides to commit a crime, they assume the risks of those crimes. Those risks are not just incarceration and fines. The criminal may be injured, accidentally or by victims' resisting. The criminal also impose on their family and friends the risk of losing the criminal to incarceration or, as with illegals, the criminal being deported.
That common sense is verbosely expressed, but the point is, the responsibility for separations is 100% on the deported illegal. Even more briefly, FAFO.