Jim Carrey doesn't care if he torpedoes his new movie "Kick-Ass 2" ... he's speaking his mind ... bashing the film's extreme violence in the wake of last year's massacre at Sandy Hook Elementary School.
Jim -- who plays Colonel Stars and Stripes -- tweeted his sentiments today, saying, "I did Kickass a month b4 Sandy Hook and now in all good conscience I cannot support that level of violence.”
He added, "My apologies to others involved with the film. I am not ashamed of it but recent events have caused a change in my heart.”
The film, due out in August, is a highly anticipated sequel. The first one grossed almost $100 million worldwide. Make no mistake, to have Carrey -- by far the movie's biggest star -- drop his support is a huge blow.