I feel like you struggle with the concept of "jurisdiction", and if we were going to look at the holistic picture, rather than charging foreign refugees with child endangerment, we'd be offering them reparations eg subsidizing schooling the way USAID used to until Lord Musk and the DOGE boys took a chainsaw to it.
I still think it's ridiculous that you refer to ICE detention as "kid gloves."
Again, rather than ignoring migrant families, the US government actively targets them; ICE uses Palantir surveillance software to track down and arrest hundreds of parents and relatives simply because they stepped forward to sponsor their unaccompanied migrant children, and now thousands of children are currently in the US foster care system because their parents were deported without them.
You are right, though, that marginalized US citizens face aggressive state intervention and child separation. The US criminal justice and child welfare systems frequently target poor domestic parents, using the threat of child removal to coerce them or punish them.
For example, marginalized women facing minor charges or accused of drug use have faced secret child welfare proceedings, incarceration, and having their newborns placed directly into the foster care system. Domestically, the carceral system routinely tears families apart, leaving hundreds of thousands of parents locked in jail and missing from their children's lives.