Would it be better if fluther has the 'Blacklist' feature?

Do you think fluther would be a better site if each user has the option to block/repel one’s(unwanted/annoying user) appearance/influence in his/her question/PM? This will prevent further conflict/provocation between some people.
(Of course this won’t include the moderator since it’s their job. But I believe this new feature will help moderator to control this site).