If a Comment has no thread hanging off of it, I can *easily* hide it

(User Story, Closed -> Fixed, Priority: Critical, Test Status: No automated tests yet , Reported By Bad Link: Thing 3y284oe not found, )
Conversations
Summary: This might be implemented as Archive, or possibly as a real-and-for-true Delete. (Although that's architecturally dangerous.)
Eric really wants this -- he has an accidental comment on his Space, which is annoying him.
If a comment has a thread, this becomes more problematic. (Which needs some thought, given the structure of the Main Thread.) But if it's a terminal node, there doesn't seem to be any problem with it.