Children and people are humans, not goats or sheep. I'm saddened that you are confused by that.
What was your name in the States?
Crossing borders to rape loot and pillage or to evade the law has been a sport for a very long time.
Butch Cassidy and the Sundance Kid come to mind.
Americans are easy targets. They are complacent, compassionate, and not able to defend themselves.
There is a belief that everyone crossing the border is a poor victim who just wants a job and a better life.
For many crossers, that may be true but there are those who come to rape loot and pillage.
There are mechanisms in lawful, legal entry that can make some effort to weed out the bad actors.
However, all the crossers are "poor pityfuls" to Biden and many Democrats.
Anyone who mentions there might be bad actors amongst those "poor oppressed" is labeled a racist and incipient Klan.
No country should allow undocumented illegals into the country.
Criminals, gangs and foreign military are border jumpers, historically.