If it looks like a cage, is build like a cage and is used to cage people in, then it is a cage.
I don't know why so many people cry foul at that word.
If I drop an big explosive something on you, it is a bomb, even if the military likes to call it propelled shell, autonomous neutralization device or whatever.
That's funny, you are not using the word "cage" with a negative connotation?
The reason that word has become important is because we have the media pushing a totally false narrative that the president said that immigrants are "animals", that is why the word "cage" is important. I have chain-link fence in my backyard, is it a cage?