I would expect the vast majority of people to oppose such material too. But this legislation goes FAR beyond that. It is very vague as to what acts are covered, and criminalises material that realistically portray things, whether they happened or whether they were just simulations, and because it's so vague as to what's covered, it extends it's scope far beyond such overt material.
That is a large part of why it's possible to object - the scope.
On the contrary.
If that were the case, we the people would have no grounds for objecting to bad laws if we weren't highly competent with the written word, and the often obtuse phraseology of legalese. It's quite possible for someone totally illiterate to know bad law when they hear it. And some bad laws need to just be scrapped, not reworded.
We aren't lawyers, or lawmakers. But we're entitled to have an opinion if we think a law is bad without having to draft a better one before being entitled to that opinion. That is, after all, the job of Parliament.
If a laws bad, it's bad and individuals are quite entitled to say that to their representatives, or to post here about it, or to write articles for papers, without needing to skill set to write laws themselves.