Because pedophiles and terrorists exist and this is why we can't have nice things.

And things get nicer when you kill those people.

99.999% of the population of Earth will never be directly affected by either of those two things, so at the very least you're going to have to expand on how eroding the privacy of those 8 billion people will make their life better.

Aren't the statistics on child sexual abuse pretty dire?

They certainly don't line up with 99.999% of the population of earth being unaffected.

No we can't have nice things because of fascist lackies who use any excuse. If terrorists and pedophiles somehow didn't exist it would be spying or organized crime.