I mean, sometimes content is intentional. Look at the revision historyrevision history on this:
Centos 6.3 install reiserFS supportCentos 6.3 install reiserFS support
The question was from 2012. The content within was deliberate, and this was the accepted answer.
What motivation would someone have to edit 4 years after the fact, have the content rolled-back by the author, then make the same edit again?!?
It's disrespectful.