What if the tool required an "un-safeword" to do destructive things?
"Do you really want to 'rm -rf /'? Type 'fiberglass' to proceed."
Like tarsnap's --nuke command:
--nuke Delete all of the archives stored. To protect against accidental
data loss, tarsnap will ask you to type the text "No Tomorrow"
when using the --nuke command.
There is a package called molly-guard that makes you type the computer's hostname when you are trying to do a shutdown or restart. I love it.