Slider destroy has irrecoverable implications where directories and registries are permanently deleted. For some applications this could mean loosing valuable data. It might be a good idea to introduce a --force switch, so that admins/application-owners are given a chance to ensure they know what they are doing.
This is something in-line with git clean. When invoked by default it fails with a message saying -f is mandatory (unless the git config variable clean.requireForce is set to false). If the user is confident he/she will re-run the command with the force switch.
Slider could do something similar.