--no-preserve-root
rm does, now, protect you from recursive deletes of your root FS. You have to pass it "--no-preserve-root" in order for total destruction.
https://www.gnu.org/software/coreutils/manual/html_node/Treating-_002f-specially.html
I wonder how many stressed-sysadmin-hours that feature has saved :-)
Biting the hand that feeds IT
