This is one of the reasons Trump wanted to firmly close the border. You can’t blame these people for wanting to come to the US if it’s easy to get in. So that just lets the human traffickers go wild, pack them into vans or semi trailers or anything they can get them into, and this is what happens. There were many incidents like this until Trump got a grip on the border situation.
But now the traffickers are high fiving each other because they can go back to business as usual. Now nobody cares what happens to the people they ship in, but Trump did.
They pay over 8 grand per person to the coyote to get into America, and the drug cartels get rich.