"We should be able to have any conversation, no matter how distasteful it is." – Sergio Redegalli Artist Sergio Redegalli says he's received violent threats in response to his anti-burqa and anti-Islam murals painted on his Sydney home. The murals are visible from a nearby train line. Sergio says he's exercising his right to freedom of speech and artistic expression, but others say he's vilifying a particular group. Kieran Butler says he's received violent threats too. He and fellow amateur comedian Angelo D'Costa organised a comedy debate called "There's Nothing Funny About Rape" a few years ago. It didn't go to plan. Several people took offence and demanded the Melbourne venue cancel the event. With the Federal Government proposing to remove provisions which "unreasonably limit freedom of speech" in the Racial Discrimination Act, Insight asks just how free our speech is – and how free should it be.