Clunck, if you think you are the only country in the world that is affected by ISIL and have sympathisers and people who oppose military intervention against them, then you are mistaken. When Parliament was voting on military intervention in Iraq, there was a group of anti-war protesters, protesting outside Downing Street. They totally disregarded the feelings of the families of the hostages.
Sometimes, a little bit of light hearted humour goes a long way. We all hate ISIL, so it's only natural that we ridicule them.