I've never understood why people see the need to write 'sorry if I've offended anyone' after they've posted something.
Either they didn't set out to offend anyone, in which case if someone does take offence then it's that person that has the issue, not the poster. Or if they did set out to offend then they're not going to be sorry if someone takes offence.
It's the same reason people use emoticons. So much of the tone is lost in the written word. You can unintentionally offend. If I say something not intending to offend that someone takes offence from I am still sorry I made them feel like that. Even if I didn't mean to.