European hot take coming in, beware...
While this solution is definitely not ideal, it seems like Trumps' absolute dedication to twist and contort any kind of federally-run agency/institution/procedure into the absolute worst and most cruel version of itself has led to people understandably compeltely rejecting anything that resembles what Trump has done even on a surface level...
Yes, people are conflating two very different issues, both of which were boiled down to "kids in cages" on social media.
1. Trump pursued a policy of forced family separation to needlessly strip children from families who crossed the border together and torture them to the extent allowed by US law as a deterrent to dissuade immigrant families from trying to come to the US. This policy was officially abandoned after an outcry, but the Trump admin may have continued to do it to a small extent afterwards (not sure if this was confirmed) and took such poor records that even now hundreds of these children have not been reunited with their family.
2.
Since federal law does not allow unaccompanied minors to be deported, desperate immigrants have in recent years been using the tactic of training their children to cross the border alone, sometimes in hopes that they will establish a path for immigration for the rest of the family, sometimes simply out of desperation to save their children from a perceived worse fate in their home countries.
As a result, border facilities are filling up with unaccompanied children that the US has a legal and moral obligation to take care of until they can be placed in more permanent living situations. There probably needs to be significant changes to immigration law if this is what it's incentivizing would-be-immigrants to do, but that would require extensive study and major legal changes and is not something Biden can change overnight.
Both result in "kids in cages." One is due to wanton cruelty, one is the unintended result of a long-standing (but only recently widely used) legal loophole that cannot (and perhaps should not?) be easily changed.
THEY ARE VERY DIFFERENT THINGS.