They did not have a choice but currently they did break immigration laws, the Presidents who kept them here and the parents are at fault here.
Fix the law, Obama and Trump gave an oath to uphold the law and should do so. Obama, Bush's and Clinton created a situation where these kids are put in a terrible situation.  They are all to blame and Trump should follow the law as Congress wrote it.
If for no other reason than to prevent this from happening again.