Why do people get angry when others post on an old thread in a forum?

Question

I was just searching for something and it was answered by a person who had posted on an old thread (a year old) and *I* found the answer to my question, but still everyone gets angry and all "OMG n00b u dont post on old threads!!!11."

Answer 1

it "bumps" it to the top

Answer 2

They are simply sad...

It can help by reasking / reposting a question, most of the questions on here are repeated and repeated, some people simply get fed up with the same questions / posts.

Answer 3

I post links to old threads, is that what you mean?  Sometimes someone had a much better answer than I could come up with and I think that is helpful. Why reinvent the wheel?