"It is better that ten guilty persons escape than that one innocent suffer"~judge blackstone.
it's an important thing to remember, to keep in the public consciousness at all times. it is better that a million porn sites be accessible than one innocent site be blocked.
so man atrocities of law have began with the inversion of that principle: zero tolerance, the TSA/NSA/other 3 letter agencies, the war on drugs. despots love to turn this around because it allows them to be as callous as they wish, they need not worry about who is harmed in the process so long as they get who they want.
we have forgotten this principal, though we all know it almost instinctually we often have a hard time putting it into words, unknown that it has been in words for a long time. so when given the claims that we need to be "tough on crime" or have a "war on pornography" or a "war on drugs" (the war analogy is loved because we accept casualties in war) people falter. without a reminder of WHY it is more important that the innocent be protected than that the guilty be punished people are left with little to weigh against the views of the despot that we must be "tough", we must have "zero tolerance", we must "stop it at any cost"
john adams put it best:
"It is more important that innocence should be protected, than it is, that guilt be punished; for guilt and crimes are so frequent in this world, that all of them cannot be punished.... when innocence itself, is brought to the bar and condemned, especially to die, the subject will exclaim, 'it is immaterial to me whether I behave well or ill, for virtue itself is no security.' And if such a sentiment as this were to take hold in the mind of the subject that would be the end of all security whatsoever"