the answer is… it’s subjective, you just make up your own mind, and justify it with : it’s a necessity, may Allah forgive me 🥺👉👈

The answer is when you are in a death situation.

No wonder, though. It seems like you don’t even intend to learn facts about the religion you’ll believe in.

how and when you know it’s a necessity

I did the math actually. And it seems like mass surveillance will only be justified if homicide rates are higher than 20% ( if 1 out of 5 people die in murder ). And only if surveillance actually stops all the crime ( which it doesn’t ) and only if there is nothing less problematic that could be used instead ( which there are plenty techniques, like normal regular investigation, where you ask people around on their own terms ). Basically the math says it isn’t justified by an apocalyptic margin.