I guess those children brought along by their families willfully chose to have their parents or parent bring them into the USA through undocumented immigration. Why do you insist on calling these people illegals when they're just as law-abiding as you and I, except they were brought here underage and only found out they were undocumented when they got into High School or College? They are not criminals, they did not knowingly break any laws. Most of the time they don't even speak Spanish, so deporting them to Mexico where they can't speak the language and they don't know any of their family there is exceptionally cruel punishment for someone who ultimately didn't do anything except get brought over by an authority figure early on in life.
It's not a soft friendly PC name calling them undocumented immigrants, it's being realistic about the fact that not every single one of them committed any crime willingly or otherwise. Calling them illegals is absolutely pejorative, and it has no purpose other than to paint the "illegals" as nothing more than criminals. The world isn't so black-and-white, and there are a lot of privileged people who simply cannot fathom that maybe some undocumented people in America aren't here because they decided to cross the border one day, as they had little choice in the matter once their immediate family says "This is what we're doing" and the children don't even yet understand what is happening.
Not every undocumented immigrant comes to America this way, of course, but there are many who do, and to call them criminals via blanket statements is, frankly, ignorant. A child being brought over the border illegally by his/her family has two choices: Go with your family or go live on the streets. They're presented with these choices when they're often times not even old enough to comprehend anything about what's going on, other than "We're moving". I really hope you can begin to consider that maybe everyone you call "illegal" did nothing at all to earn that mean and inaccurate label. It's a pejorative term used to dehumanize the actual people involved, and there are better ways to describe this swath of people without the stigma of "Illegals".
"Affected by current laws" makes it sound like they had the unfortunate accident of being dropped in this country by mistake rather than choosing, willfully, to be in violation of the law.
It's staring you right in the face in the opening of your post, but for some reason it eludes you. There actually are a lot of people who absolutely were not brought here willingly or at an age of understanding.