I guess my .sig should read "Because I can’t"...
I really didn’t notice the Trash symbol: it’s so small I can’t make out what it’s supposed to look like. There’s too much detail in a too small icon. It’s also not in the place where I would have suspected it to be. A more conventional placement, i.e. at the bottom of the page list, or at least a more prominent icon, would be nice.
I’m (usually) pretty good at these things, and if I missed the Trash, you can bet others will too.
Anyhow, I still think it’s a bad thing that ListSiteMap shows pages that have been deleted but not purged. If deletion of a page also results in automatic unpublishing, the matter would be resolved. I guess that means that it isn’t really a bug in ListSiteMap, but a flaw in the manager section. Although it stands to reason that ListSiteMap should check the page status before showing it in the list.