So your theory is that we should all be spied on in the off chance some of the low-hanging fruit in a hypothetical criminal organization simply makes a mistake

So your theory is that we should all be spied on in the off chance some of the low-hanging fruit in a hypothetical criminal organization simply makes a mistake or goofs up enough to put it in the officials lap. Working off that theory, why not just not spy on millions of innocent civilians and let the criminal bunglers bungle anyway?