A couple of thoughts:

I'd say the teacher got at least some point across considering the outrage shown by all sorts of different victims of terrorist attacks, and the entire incident. So, I'd consider the assignment a success in regards to making sure the children knew how traumatic it is.

If it was in the US, there is little doubt in my mind that the teacher would have been fired. At least Australians are intelligent enough to look at the intent of the assignment from multiple perspectives. Yes, it was not well-calculated, but at least the teacher felt enough enthusiasm for her job to attempt some sort of creativity in her assignment, rather than just making the students answer a bunch of short questions, or something just as mindless.

I have a few other thoughts, but they have already been stated.