https://www.svt.se/nyheter/ylva-johansson-ifragasatts-om-lob...
I don't like mass-surveillance or "dragnets" which are actually considered unconstitutional in the US (see https://en.wikipedia.org/wiki/Dragnet_(policing) ), where you make an extraordinary amount of people suspects in order to catch a single suspect.
In medicine there is a number called NNT (Number Needed to Treat) which is a really good comparision to this. It's how many you have to treat with a medicine or procedure in order to help one patient. If that number goes up too large it's a bad sign, like if you would have to feed 1 million people a pill every day to avoid 1 heart attack per year.
Here you have mass surveillance and an incredible breach of privacy of 500M citizens, in order to catch how many pedos? If they would even be caught by this at all to start with.