[DarkKomunalec]

Would it be okay to mandate spy microphones in all cars, spy cameras in all rooms, and make it illegal to remove or disable them, as long as only the 'good guys', with a warrant, could access the info?

What if doing this would save N people/year from terrorist attacks?

What other rights should we sacrifice for a 'safer' society? Surely we shouldn't let terrorist recruit people, so there goes free speech. We also shouldn't let them gather together to plot their wicked plots, so there goes freedom of association. And if we could bar people at risk of committing terrorist acts, from vulnerable locations, such as subways, airports, parks with a lot of people in them, well, I'm sure that would save a few lives too.