for example ones porn history could be used against that person if he she wants to go for public office. So there is a chilling effect for watching porn. Politics are dirty allready but the way down is deep.

Maybe they should "own it" instead? I don't think these days legal porn use would be all that harmful. but i don't disagree with your point.

But look at it this way, surveillance already exists, all major governments are hacking into people's phone and spying on them, and forcing telco's to do dragnet surveillance. chat control is about doing it at a greater scale and formalizing it for normal law enforcement use instead of things like counter-terrorism.

yes and I understand the benefit but i doubt the real world consequenzes. It would only filter the criminals who are good at opsec and those who arent. imho elevating a more proffesional type of criminals. Honestly most major crimes are money related. Get rid of papermoney and make digital payments traceable for law enforcement. I know there is something like gold bitcoin etc but at the end knowing how money moves is more power then knowing what people are writing