I'd actually flag as very low quality here.

Such answers have no salvageable content and should be removed. I would also leave a comment explaining why the answer is unusable and dangerous and should be deleted:

> **Warning:** The steps in this answer will **delete all data on your system** and [may brick it altogether](https://www.phoronix.com/scan.php?page=news_item&px=UEFI-rm-root-directory). As this answer contains no salvageable content, I've flagged it as very low quality.

An actual attempt to answer the question, even if incorrect, does not merit a flag. However, this is not a genuine attempt to answer the question; instead, it's an attempt to mislead the question author and other readers.