qarael says,
"Somebody in the lj_releases community finally got a response from the support forum", a response which confirms my suspicion that they were operating under the impression that a comment is the property of the
commenter, not the owner of the journal where it was made, regardless of security context.
Some advice on how to hide the repost option boxes using custom CSS, or see
this, although of course this "fix" can't cover all cases, so isn't really a "fix" in that sense. On that first link,
"
xnguard posted their version, suitable for anyone using style=mine in a
news thread here" (btw: the link attached to "here" is wrong and links to a "subscribe to this thread" page; use
http://news.livejournal.com/129190.html?thread=87366310#t87366310 instead) I think refers to
you making use of ?style=mine, not someone else (since of course you can't alter someone else's style).