HOI4 is an interesting choice for an analogy here.

It’s unanalagous in that HOI4 sanitized itself of the Holocaust specifically so people wouldn’t be able to roleplay committing xenophobic genocide, unlike the game in question which is specifically designed to let you roleplay a pedophile rapist preying on the already abused.

However it is tangentially analogous in the sense that anime tends to have a bit of a Nazi bar issue with pedophilia thanks to people (who I’m gonna have to assume are well intentioned) unintentionally making room for pedophiles to exist and operate with arguments just like the ones you’re making here.

Of course video games don’t cause violence. The only people interested in the pedophile rapist roleplay visual novel, though, are very likely people with an interest in pedophilia. The government is right to monitor and remove people who acquire CSAM instead of going to therapy from society and it isn’t overreach to protect children in this way. Is there a potential for such a system to be abused by the government? Yes, of course, but such is true of any system. Preventing government abuse and corruption is separate from stopping the distribution of CSAM and protecting children from predators.