so, on the world wide web, where we are chatting, especially on Stack Exchange sites, people write posts, e.g. questions and answers, which are sometimes deleted because they are offensive. So you might say "These posts have been removed in case they cause offence", which is to say, posts on SE have been deleted in case they offend someone.
A pun is a play on words where a sentence (or sentences) is constructed that sounds like one thing but means another.
So in the picture CowperKettle showed us, fence posts are being removed. The reason given for the removal is so that a fence is not caus…