"Reverse ignore" is a very bad idea.

[lumberjack_jeff]

If one wants to send messages to their cadre of supporters, there's always private messages or the profusion of groups "intended to be a safe place to discuss...".

One withholds their opinion by not expressing it. When one whispers among friends, they're not withholding opinion, they're creating a clique.

[Skinner]

1. We are well aware that there is the potential for abuse.

If we do choose to provide a function like this, we would be sure to have some pretty strict limits to curb its abuse.