These are all forms of false positives but the most popular news stories seem to be where they detain the correct person, correct legal status, lawfully, and the story happens to gloss over the facts about the legal status and focuses on the hardship. Yeah, it's a hardship to be split from your family, I can't deny that. But I'm not aware that most countries are very sympathetic to illegal immigrants.

If anything I find the stories featuring white/European people oddly racist because they seem to assume that I, the reader, will assume a white/European person couldn't possibly be in violation of immigration rules. But all the ones I've read turned out that they were indeed in violation of immigration rules.

Overall as a potential immigrant to the US myself, I find the process capricious and that US citizens by birth don't fully appreciate how painful it is or why it shouldn't be that way. But I don't find it notably worse or more onerous than the vast majority of immigration policies of other countries in practice.