The behavior sounds considered; the web site doesn't describe it to the user.
How about if the Destroy dialog read something like:
This is irreversible. We will destroy your droplet and all associated backups immediately. We will keep a snapshot that you can use to recover your droplet; you can disable this below.
[v] Scrub data - [etc.]
[v] Temporary snapshot - this will keep a snapshot that you can use to recreate your droplet. This snapshot will be destroyed in 24 hours.
and the Select Image list showed something like:
Destroyed Droplets
chef.nl-haa1.infr.as f… — automatically deleted at 2014-04-01 09:25 UTC
How about if the Destroy dialog read something like:
and the Select Image list showed something like: