Both of those instances are not actually the introduction of anything new - they are simply cases of the law being applied as written.
I don't imagine the simpsons porn issue will change - afterall, which politician would want to soften an anti-child porn law?
But the video game issue is being actively challenged, and most of the country wants to change it, and it's just a matter of time until it is changed. The only reason it hasn't already been fixed is because of the bizarre rule that any changes to the classification system have to be agreed to by the Attorneys General of every state - and the S.A. Attorney General (the Michael Atkinson from this story, coincidentally) keeps digging in his heels and coming up with more and more ridiculous reasons why the change would be bad. However, he's unlikely to remain Attorney General after S.A's approaching election, so the problem will go away.
One thing to be careful of when judging the state of things in the other country, is that negative proposals or plans like this always generate headlines. The more important story, where the plan is cancelled, or defeated almost never does.
In this particular case, Atkinson has already ditched this plan, due to the massive public outcry - but you won't see a followup story saying that. So as a result someone that only reads headlines would have a very warped idea of the truth.