I don't really think it is a rule, more of a deficiency in how the interface was programmed. Instead of actually deleting the friend from your list, it seems like it just hides it from your list. Just from knowing what else needs to be done on the site, I doubt ioi is going to fix it anytime soon. Maybe if he finds another programmer he trusts, a lot of the minor bugs would get fixed.
Obviously though, if they were your friend in the first place you would never have deleted them.








