This thread is about freedom of speech and the government limiting the content and media you have access to. Australia already has gun laws that are held up as a model of what every western country should emulate, so that is a non-issue in this case.
We should compare the murder rates of countries that limit internet content, such as China and Saudi Arabia. Both have comparable murder rates to Australia, but think about how much lower it could be if certain content was limited. Especially with the rise of right wing violence, it would limit their efforts to normalize violence against others. So maybe these ham-fisted laws are worth it if they end up reducing violence in the long run. Or not.