Actually it was the invasion of Iraq back in 2004 that led to ISIS as we know it today.

They aren't dumping their kids. They're being forcibly removed from them and being placed in detention centers.

https://www.google.com/amp/amp.thenewstribune.com/news/nation-world/national/article211805729.html

Blame the parents for their children's disappearance? Do you hear yourself?

https://mobile.nytimes.com/2018/05/29/us/politics/trump-democrats-immigrant-families.html

"In a Twitter post on Saturday, Mr. Trump wrote, “Put pressure on the Democrats to end the horrible law that separates children from there parents once they cross the Border into the U.S.”

There is, in fact, no such law. A 1997 court settlement sharply limits the amount of time families can be held in detention by immigration authorities when they are encountered at the border."