Why aren't the initial friend-stream settings applied after adding a friend?

Scenario:

I receive a friend request from someone I don't necessarily know or know that well, but I add them anyway, and I *uncheck* sending their updates to my friend-stream. Their updates show up anyway.

In order to remove them from my friend-stream I have to go to "Friends" and then edit the friendship settings again, then save them. This removes them from my friend stream while maintaining them as a friend.