> "It seems like the scope of the original warrant could be attributed more to ignorance than to malevolence." .
That is irrelevant. If you are ignorant, mentally deficient, deaf and blind, stupid, forgetful, whatever your excuse then you had better hope that the other person didn't have reason to suspect that you are wrong - it's old Case Law, don't know don't do but the one charged has the weight of the Law slightly favored towards them.
EG: Your car alarm goes off, you look out the window and see someone walking down the street, you attempt to detain that person; they don't have to inquire about anything and are entitled to attack you without warning and do enough damage to ensure that you don't repeat what they presume to be your error - because surely they will be charged if they injure you most severely, and that makes the argument slightly in their favor over whatever you thought you were doing.
Similarly getting blanket info about people who might have visited a website due to a mis-click, viral program/clickjack/clickbait AD, or did visit purposefully with no INTENT of wrongdoing are not to be subjected to State Surveillance (in North America, in other countries you could be hung for littering).
The reason we have such Rights has been tested in the Courts of Canada and the United States frequently. Here's one example:
http://www.stcatharinesstandard.ca/2015/01/15/when-victims-become-criminals .
The Right to speak, even about stupid/wrong things is protected, it's really only an extension of the Right to defend oneself and one's home.
Being physically present during a Riot isn't illegal until the Police give a speech officially declaring it a riot and ordering everyone to disperse.
People not enjoying North America Laws waste their thoughts on deaf people protesting in this Forum. Go to your Lawyer or pay for Law School and undo decades of Case Law - otherwise: decide not what you know not.
It's like people who wouldn't go out at night but they know it's safe on the Internet night or day, your ignorance can't save you.