How about because the separation was so that the Trump administration could determine if the children were actually those of the adult 'parents' or just props to give illegals a better chance at being allowed to stay, or worse yet as was found under the Obama/Biden administration allowed the children were allowed in no question only to be sold into prostitution and slavery. God forbid that under Trump there was separation to protect the children.
My solution? Any of these people bitching about being separated from their actual children for a time should be given as compensation, first class tickets back to where they came from so that they can legally apply for entry and get in line, that way they won't be separated from their children. In other words STFU and go home.
And as to the communist ACLU, why haven't we heard a peep from them about the Jan 6 political prisoners? Actual, you know Americans whose actual Civil Liberties are being violated?