I've just come across this thread and had no knowledge of Tommy Tiernan until I saw a live show of his last year. I found him at times very funny and at others too OTT for me. However I write to throw some light on what I think is his approach to comedy, whether you like it or not. He appears to believe as a principle that no subject is too sensitive for comedy and during the performance I saw refered to recent events where extremists had used mentally disabled people as suicide bombers, and then said that even he couldn't find anything funny to say about that -- pause -- wicked grin -- 'but there again' -- and launched into a pretty good joke about an impossible subject. I strongly suspect that a lot of his extreme humour comes from this angle -- you may not like it but you should be very careful about banning it.