Once again we have a plotline involving supposedly sympathetic people planning mass murder and/or the destruction of the world for the sake of some stupidity. Charming.
As for Matt: it's pretty clear that nobody cares about him. He's the last human of the group, and nobody bothers to suggest giving him Jeremy's ring.
Regarding Damon: Seriously? Your solution is to turn off the emotions of a newbie vampire...? She's your sire
. You could have just told her to be at peace over Jeremy's passing. You didn't need to shut all her emotions down and turn her into ripper 2.0 (or 3.0?).