The use of a child to hold a sign which he cannot understand is a sad reflection on his parents.
I support free speech – if the parent of this child thinks that those who insult Allah should be killed – let her say so and preferably explain why this attitude is consistent with living in a liberal democracy. Of course she should then be arrested for inciting violence – or worse (ie actually commit such a murder) – and deported (if not living validly in Australia) or thrown into jail.
This is where proponents of restricting free speech are being disingenuous. They try to obfuscate by saying that we need to restrict free speech because people might offend others and then bring in examples not dissimilar to the placard above. Yet the action of inciting violence, or committing murder are well established crimes.
We do not need to restrict free speech – we just need to enforce laws and not turn a blind eye to the extreme behaviour of some segments in our community.