How are we supposed to change their minds? By pretending that not causing offense to their religion is more important than freedom of expression? Because in our society, that just isn't true. In a free society, religion is not exempt from criticism or satire or mockery. You can certainly show your disapproval - that's all a part of free speech too - but you don't get to hurt or kill or threaten people because you don't like what they're saying. I think that reaffirming those values is the good this does.