by which you mean in immigration holding cells, after being separated from their apparent guardians, as an anti-trafficking measure.
so what would you do?
Who built the cages? https://lmddgtfy.net/?q=who%20built%20cages%20for%20children
You’re making https://news.ycombinator.com/item?id=25673162 ’s point.
Who cares?
There’s all kinds of less-objectionable potential uses of the cages than the ones to which the Trump Administration has put them. Building them isn’t the problem.
They were built to keep children separate from each other (gender segregated) and from adults: https://www.usatoday.com/story/news/factcheck/2020/08/26/fac...
People are only cross about this because it's Trump.
The policy of deliberately maximizing use of the cages by maximizing family separation and using the induced psychic harm as a deterrent is a policy adopted by the Trump Administration.
The policy of requiring segregated detention of children, when actually detained, which caused the cages to be necessary was a judicially-imposed policy.
The policy of minimizing detention of children so as to minimize the use of the cages, including not detaining adults accompanying children without reason beyond illegal crossing, was a direct response to that judicially-imposed policy by the Obama Administration that was abandoned by the Trump Administration.
So, if one is using “built the cages” with the peculiar meaning you suggest of “adopted the policy for their use that is the subject of the objections”, Trump “built the cages”.
[0]https://media.npr.org/assets/img/2018/06/18/ap_1816885517410...
Yes it is bad that children were arrested under Obama. Obama should absolutely have to answer to those crimes. But so should Trump. In addition Trump also needs to answer for the child separation (not done under Obama). Yes, Obama needs to answer for war crimes and extrajudicial killings, but so should Trump, and in addition Trump needs to answer to toxic rhetoric, inciting racism, inciting racism, inciting people not to follow public health protocols, etc.