All those things are terrible, but how do they fit with "but these are things that don’t necessarily need to be true as long as they’re believed."? Illegally s

All those things are terrible, but how do they fit with "but these are things that don’t necessarily need to be true as long as they’re believed."? Illegally spying on people only seems worth doing if you're not just making things up. If you are then why bother risking illegally spying and leaking?