The problem from Koster's perspective is that when the target of harrassment/abuse/etc. turns off the source feed the feed still goes into the target's community. The communications analogy is not hanging up the telephone. The harrasement/abuse/etc. is delivered in public. Even if the target does not see it, the target's community does.
Perhaps an analogy is that one afternoon all of the target's neighbors opened their mailbox to find a flier falsely asserting that the target was a child molester. Most of the intended effect stems from the target's neighbors reading the flier. It doesn't matter much if the target read it. And in conversations with neighbors, "no I did not read it" does not make it better...and the fact that there are conversations with neighbors means that not reading the flier is not a way of avoiding the harassment/abuse/etc.
The problem from Koster's perspective is that when the target of harrassment/abuse/etc. turns off the source feed the feed still goes into the target's community. The communications analogy is not hanging up the telephone. The harrasement/abuse/etc. is delivered in public. Even if the target does not see it, the target's community does.
Perhaps an analogy is that one afternoon all of the target's neighbors opened their mailbox to find a flier falsely asserting that the target was a child molester. Most of the intended effect stems from the target's neighbors reading the flier. It doesn't matter much if the target read it. And in conversations with neighbors, "no I did not read it" does not make it better...and the fact that there are conversations with neighbors means that not reading the flier is not a way of avoiding the harassment/abuse/etc.