The creator of the Kick-Ass movie franchise has hit back at Jim Carrey after the actor publicly withdrew his support for the film over its depiction of violence. The Dumb & Dumber star announced on Sunday (23Jun13) he had experienced a change of heart about his upcoming release Kick-Ass 2, following the gun massacre at Connecticut's Sandy Hook Elementary School last December (12). He tweeted, "I did Kickass (sic) a month b4 (before) Sandy Hook and now in all good conscience I cannot support that level of violence. My apologies to others involve (sic) with the film. I am not ashamed of it but recent events have caused a change in my heart." Mark Millar, who wrote the Kick-Ass comic books and is a producer on the films, admits he is "baffled" by Carrey's statement as he insists the star knew all about the script's gory content when he signed up for the role. Millar also reveals Carrey was drawn to playing Colonel Stars and Stripes as the character is a vigilante who refuses to use a gun. In a post on his website, Millar writes, "I'm baffled by this sudden announcement as nothing seen in this picture wasn't in the screenplay eighteen months ago. Yes, the body-count is very high, but a movie called Kick-Ass 2 really has to do what it says on the tin... "Ironically, Jim's character in Kick-Ass 2 is a born-again Christian and the big deal we made of the fact that he refuses to fire a gun is something he told us attracted him to the role in the first place. Ultimately, this is his decision, but I've never quite bought the notion that violence in fiction leads to violence in real-life any more than Harry Potter casting a spell creates more Boy Wizards in real-life." The forthcoming sequel, a follow-up to Matthew Vaughn's 2010 hit, stars Aaron Taylor-Johnson and Chloe Grace Moretz as youngsters who team up to fight bullies.