The problem as stated in the original comment isn't that child porn as drawings is forbidden, or even that the interpretation of such is ambiguous. Or to be precise, it is not the only problem. The argument made is that these laws do not exist for their apparent intent (safety of children), but only as an excuse to exercise otherwise unlawful oppression and suppression of freedoms.

I don't find this assertion very plausible honestly, especially if this would be an argument against the existence of these very laws, because its not really an argument against government backdoors and such.

You could make the same argument (of ambiguity) with almost any crime, because there are always cases where a crime is hard to prove completely without any risk of failure, especially in the realm of sexual assault.

I'm not taking a position here, honestly I'm unsure about it, but the reasoning is sloppy and the allegations of abuse seemingly pulled out of thin air. There is also no case for why the poster is being investigated other than the pornography. It would be more plausible if there was some kind of civil disobedience involved. As stated, I'm inclined to put this in the category conspiracy theory.