Why is it that in a thread where something is posted that's already been posted so many retarded tools need to go in there and say repost, why not just done?

IF YOU SAY REPOST AND SOMEONE ALREADY SAID THAT AREN'T YOU REPOSTING THAT?

It's annoying as hell and I can almost name everyone who does it, it's always the same people who go in FS threads stating they didn't follow the rules or "IBTL."