The only way of being anonymous in Sweden is illegal?

This sounds like it would be great for an embarrassment campaign of tracking all politicians and C-levels responsible for this. Basically, it's the elonjet all over again.

If showing the data is legal, then highlighting specific datapoints should be as well.

The ones responsible for this would not really care if you highlighted them.

I don't think this is true. You can apply for "Skyddade personuppgifter" (Protected personal data) which means your details won't be publicly viewable. Here is the documentation from the police: https://polisen.se/utsatt-for-brott/hjalp-och-stod-fran-samh... and here is the details from the tax agency: https://www.skatteverket.se/foretagochorganisationer/myndigh...

I know bunch of other people who have protected identities who are not findable via the usual services, who applies for either "Skyddade personuppgifter" or "Sekretessmarkering".

Details default to being public though, which the argument can be made both for and against it being a good idea. I love the idea that salaries are public on a national level, but less loving of the idea that everyone's address being public. At least there is some form of protection if you need it.

I'm more worried about the national DNA database (PKU-registret - https://sv.wikipedia.org/wiki/PKU-registret) where literally every single citizen who been born in Sweden after 1975 is in. Seems usage by police and others are increasing while the purpose was suppose to be only for research.

"This system was built and created for a different time where criminality was pretty much absent in Sweden"

When was this golden age of (almost) no crime, I wonder?

I don't think it reduces the value of data. It might reduce the acquisition cost, but not the value.