Comment 8 for bug 1089289

A unit that has not yet started running can already be removed with a plain `destroy-unit`, but once it's started a forcible removal becomes unsafe -- any processes started by the charm will continue to run, will interact unpredictably with new units on the same machine, and may even become a security risk. `destroy-machine --force` allows a whole machine (and all its units) to be decommissioned at once, and is the only safe way to accomplish forcible removal of running units; hence, WONTFIX.